1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
3 */
4 #ifndef _LINUX_BPF_H
5 #define _LINUX_BPF_H 1
6
7 #include <uapi/linux/bpf.h>
8 #include <uapi/linux/filter.h>
9
10 #include <linux/workqueue.h>
11 #include <linux/file.h>
12 #include <linux/percpu.h>
13 #include <linux/err.h>
14 #include <linux/rbtree_latch.h>
15 #include <linux/numa.h>
16 #include <linux/mm_types.h>
17 #include <linux/wait.h>
18 #include <linux/refcount.h>
19 #include <linux/mutex.h>
20 #include <linux/module.h>
21 #include <linux/kallsyms.h>
22 #include <linux/capability.h>
23 #include <linux/sched/mm.h>
24 #include <linux/slab.h>
25 #include <linux/percpu-refcount.h>
26 #include <linux/stddef.h>
27 #include <linux/bpfptr.h>
28 #include <linux/btf.h>
29 #include <linux/rcupdate_trace.h>
30 #include <linux/static_call.h>
31 #include <linux/memcontrol.h>
32
33 struct bpf_verifier_env;
34 struct bpf_verifier_log;
35 struct perf_event;
36 struct bpf_prog;
37 struct bpf_prog_aux;
38 struct bpf_map;
39 struct sock;
40 struct seq_file;
41 struct btf;
42 struct btf_type;
43 struct exception_table_entry;
44 struct seq_operations;
45 struct bpf_iter_aux_info;
46 struct bpf_local_storage;
47 struct bpf_local_storage_map;
48 struct kobject;
49 struct mem_cgroup;
50 struct module;
51 struct bpf_func_state;
52 struct ftrace_ops;
53 struct cgroup;
54
55 extern struct idr btf_idr;
56 extern spinlock_t btf_idr_lock;
57 extern struct kobject *btf_kobj;
58 extern struct bpf_mem_alloc bpf_global_ma;
59 extern bool bpf_global_ma_set;
60
61 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
62 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
63 struct bpf_iter_aux_info *aux);
64 typedef void (*bpf_iter_fini_seq_priv_t)(void *private_data);
65 typedef unsigned int (*bpf_func_t)(const void *,
66 const struct bpf_insn *);
67 struct bpf_iter_seq_info {
68 const struct seq_operations *seq_ops;
69 bpf_iter_init_seq_priv_t init_seq_private;
70 bpf_iter_fini_seq_priv_t fini_seq_private;
71 u32 seq_priv_size;
72 };
73
74 /* map is generic key/value storage optionally accessible by eBPF programs */
75 struct bpf_map_ops {
76 /* funcs callable from userspace (via syscall) */
77 int (*map_alloc_check)(union bpf_attr *attr);
78 struct bpf_map *(*map_alloc)(union bpf_attr *attr);
79 void (*map_release)(struct bpf_map *map, struct file *map_file);
80 void (*map_free)(struct bpf_map *map);
81 int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
82 void (*map_release_uref)(struct bpf_map *map);
83 void *(*map_lookup_elem_sys_only)(struct bpf_map *map, void *key);
84 int (*map_lookup_batch)(struct bpf_map *map, const union bpf_attr *attr,
85 union bpf_attr __user *uattr);
86 int (*map_lookup_and_delete_elem)(struct bpf_map *map, void *key,
87 void *value, u64 flags);
88 int (*map_lookup_and_delete_batch)(struct bpf_map *map,
89 const union bpf_attr *attr,
90 union bpf_attr __user *uattr);
91 int (*map_update_batch)(struct bpf_map *map, struct file *map_file,
92 const union bpf_attr *attr,
93 union bpf_attr __user *uattr);
94 int (*map_delete_batch)(struct bpf_map *map, const union bpf_attr *attr,
95 union bpf_attr __user *uattr);
96
97 /* funcs callable from userspace and from eBPF programs */
98 void *(*map_lookup_elem)(struct bpf_map *map, void *key);
99 long (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
100 long (*map_delete_elem)(struct bpf_map *map, void *key);
101 long (*map_push_elem)(struct bpf_map *map, void *value, u64 flags);
102 long (*map_pop_elem)(struct bpf_map *map, void *value);
103 long (*map_peek_elem)(struct bpf_map *map, void *value);
104 void *(*map_lookup_percpu_elem)(struct bpf_map *map, void *key, u32 cpu);
105
106 /* funcs called by prog_array and perf_event_array map */
107 void *(*map_fd_get_ptr)(struct bpf_map *map, struct file *map_file,
108 int fd);
109 /* If need_defer is true, the implementation should guarantee that
110 * the to-be-put element is still alive before the bpf program, which
111 * may manipulate it, exists.
112 */
113 void (*map_fd_put_ptr)(struct bpf_map *map, void *ptr, bool need_defer);
114 int (*map_gen_lookup)(struct bpf_map *map, struct bpf_insn *insn_buf);
115 u32 (*map_fd_sys_lookup_elem)(void *ptr);
116 void (*map_seq_show_elem)(struct bpf_map *map, void *key,
117 struct seq_file *m);
118 int (*map_check_btf)(const struct bpf_map *map,
119 const struct btf *btf,
120 const struct btf_type *key_type,
121 const struct btf_type *value_type);
122
123 /* Prog poke tracking helpers. */
124 int (*map_poke_track)(struct bpf_map *map, struct bpf_prog_aux *aux);
125 void (*map_poke_untrack)(struct bpf_map *map, struct bpf_prog_aux *aux);
126 void (*map_poke_run)(struct bpf_map *map, u32 key, struct bpf_prog *old,
127 struct bpf_prog *new);
128
129 /* Direct value access helpers. */
130 int (*map_direct_value_addr)(const struct bpf_map *map,
131 u64 *imm, u32 off);
132 int (*map_direct_value_meta)(const struct bpf_map *map,
133 u64 imm, u32 *off);
134 int (*map_mmap)(struct bpf_map *map, struct vm_area_struct *vma);
135 __poll_t (*map_poll)(struct bpf_map *map, struct file *filp,
136 struct poll_table_struct *pts);
137
138 /* Functions called by bpf_local_storage maps */
139 int (*map_local_storage_charge)(struct bpf_local_storage_map *smap,
140 void *owner, u32 size);
141 void (*map_local_storage_uncharge)(struct bpf_local_storage_map *smap,
142 void *owner, u32 size);
143 struct bpf_local_storage __rcu ** (*map_owner_storage_ptr)(void *owner);
144
145 /* Misc helpers.*/
146 long (*map_redirect)(struct bpf_map *map, u64 key, u64 flags);
147
148 /* map_meta_equal must be implemented for maps that can be
149 * used as an inner map. It is a runtime check to ensure
150 * an inner map can be inserted to an outer map.
151 *
152 * Some properties of the inner map has been used during the
153 * verification time. When inserting an inner map at the runtime,
154 * map_meta_equal has to ensure the inserting map has the same
155 * properties that the verifier has used earlier.
156 */
157 bool (*map_meta_equal)(const struct bpf_map *meta0,
158 const struct bpf_map *meta1);
159
160
161 int (*map_set_for_each_callback_args)(struct bpf_verifier_env *env,
162 struct bpf_func_state *caller,
163 struct bpf_func_state *callee);
164 long (*map_for_each_callback)(struct bpf_map *map,
165 bpf_callback_t callback_fn,
166 void *callback_ctx, u64 flags);
167
168 u64 (*map_mem_usage)(const struct bpf_map *map);
169
170 /* BTF id of struct allocated by map_alloc */
171 int *map_btf_id;
172
173 /* bpf_iter info used to open a seq_file */
174 const struct bpf_iter_seq_info *iter_seq_info;
175 };
176
177 enum {
178 /* Support at most 10 fields in a BTF type */
179 BTF_FIELDS_MAX = 10,
180 };
181
182 enum btf_field_type {
183 BPF_SPIN_LOCK = (1 << 0),
184 BPF_TIMER = (1 << 1),
185 BPF_KPTR_UNREF = (1 << 2),
186 BPF_KPTR_REF = (1 << 3),
187 BPF_KPTR = BPF_KPTR_UNREF | BPF_KPTR_REF,
188 BPF_LIST_HEAD = (1 << 4),
189 BPF_LIST_NODE = (1 << 5),
190 BPF_RB_ROOT = (1 << 6),
191 BPF_RB_NODE = (1 << 7),
192 BPF_GRAPH_NODE_OR_ROOT = BPF_LIST_NODE | BPF_LIST_HEAD |
193 BPF_RB_NODE | BPF_RB_ROOT,
194 BPF_REFCOUNT = (1 << 8),
195 };
196
197 typedef void (*btf_dtor_kfunc_t)(void *);
198
199 struct btf_field_kptr {
200 struct btf *btf;
201 struct module *module;
202 /* dtor used if btf_is_kernel(btf), otherwise the type is
203 * program-allocated, dtor is NULL, and __bpf_obj_drop_impl is used
204 */
205 btf_dtor_kfunc_t dtor;
206 u32 btf_id;
207 };
208
209 struct btf_field_graph_root {
210 struct btf *btf;
211 u32 value_btf_id;
212 u32 node_offset;
213 struct btf_record *value_rec;
214 };
215
216 struct btf_field {
217 u32 offset;
218 u32 size;
219 enum btf_field_type type;
220 union {
221 struct btf_field_kptr kptr;
222 struct btf_field_graph_root graph_root;
223 };
224 };
225
226 struct btf_record {
227 u32 cnt;
228 u32 field_mask;
229 int spin_lock_off;
230 int timer_off;
231 int refcount_off;
232 struct btf_field fields[];
233 };
234
235 /* Non-opaque version of bpf_rb_node in uapi/linux/bpf.h */
236 struct bpf_rb_node_kern {
237 struct rb_node rb_node;
238 void *owner;
239 } __attribute__((aligned(8)));
240
241 /* Non-opaque version of bpf_list_node in uapi/linux/bpf.h */
242 struct bpf_list_node_kern {
243 struct list_head list_head;
244 void *owner;
245 } __attribute__((aligned(8)));
246
247 struct bpf_map {
248 /* The first two cachelines with read-mostly members of which some
249 * are also accessed in fast-path (e.g. ops, max_entries).
250 */
251 const struct bpf_map_ops *ops ____cacheline_aligned;
252 struct bpf_map *inner_map_meta;
253 #ifdef CONFIG_SECURITY
254 void *security;
255 #endif
256 enum bpf_map_type map_type;
257 u32 key_size;
258 u32 value_size;
259 u32 max_entries;
260 u64 map_extra; /* any per-map-type extra fields */
261 u32 map_flags;
262 u32 id;
263 struct btf_record *record;
264 int numa_node;
265 u32 btf_key_type_id;
266 u32 btf_value_type_id;
267 u32 btf_vmlinux_value_type_id;
268 struct btf *btf;
269 #ifdef CONFIG_MEMCG_KMEM
270 struct obj_cgroup *objcg;
271 #endif
272 char name[BPF_OBJ_NAME_LEN];
273 /* The 3rd and 4th cacheline with misc members to avoid false sharing
274 * particularly with refcounting.
275 */
276 atomic64_t refcnt ____cacheline_aligned;
277 atomic64_t usercnt;
278 /* rcu is used before freeing and work is only used during freeing */
279 union {
280 struct work_struct work;
281 struct rcu_head rcu;
282 };
283 struct mutex freeze_mutex;
284 atomic64_t writecnt;
285 /* 'Ownership' of program-containing map is claimed by the first program
286 * that is going to use this map or by the first program which FD is
287 * stored in the map to make sure that all callers and callees have the
288 * same prog type, JITed flag and xdp_has_frags flag.
289 */
290 struct {
291 const struct btf_type *attach_func_proto;
292 spinlock_t lock;
293 enum bpf_prog_type type;
294 bool jited;
295 bool xdp_has_frags;
296 } owner;
297 bool bypass_spec_v1;
298 bool frozen; /* write-once; write-protected by freeze_mutex */
299 bool free_after_mult_rcu_gp;
300 bool free_after_rcu_gp;
301 atomic64_t sleepable_refcnt;
302 s64 __percpu *elem_count;
303 };
304
btf_field_type_name(enum btf_field_type type)305 static inline const char *btf_field_type_name(enum btf_field_type type)
306 {
307 switch (type) {
308 case BPF_SPIN_LOCK:
309 return "bpf_spin_lock";
310 case BPF_TIMER:
311 return "bpf_timer";
312 case BPF_KPTR_UNREF:
313 case BPF_KPTR_REF:
314 return "kptr";
315 case BPF_LIST_HEAD:
316 return "bpf_list_head";
317 case BPF_LIST_NODE:
318 return "bpf_list_node";
319 case BPF_RB_ROOT:
320 return "bpf_rb_root";
321 case BPF_RB_NODE:
322 return "bpf_rb_node";
323 case BPF_REFCOUNT:
324 return "bpf_refcount";
325 default:
326 WARN_ON_ONCE(1);
327 return "unknown";
328 }
329 }
330
btf_field_type_size(enum btf_field_type type)331 static inline u32 btf_field_type_size(enum btf_field_type type)
332 {
333 switch (type) {
334 case BPF_SPIN_LOCK:
335 return sizeof(struct bpf_spin_lock);
336 case BPF_TIMER:
337 return sizeof(struct bpf_timer);
338 case BPF_KPTR_UNREF:
339 case BPF_KPTR_REF:
340 return sizeof(u64);
341 case BPF_LIST_HEAD:
342 return sizeof(struct bpf_list_head);
343 case BPF_LIST_NODE:
344 return sizeof(struct bpf_list_node);
345 case BPF_RB_ROOT:
346 return sizeof(struct bpf_rb_root);
347 case BPF_RB_NODE:
348 return sizeof(struct bpf_rb_node);
349 case BPF_REFCOUNT:
350 return sizeof(struct bpf_refcount);
351 default:
352 WARN_ON_ONCE(1);
353 return 0;
354 }
355 }
356
btf_field_type_align(enum btf_field_type type)357 static inline u32 btf_field_type_align(enum btf_field_type type)
358 {
359 switch (type) {
360 case BPF_SPIN_LOCK:
361 return __alignof__(struct bpf_spin_lock);
362 case BPF_TIMER:
363 return __alignof__(struct bpf_timer);
364 case BPF_KPTR_UNREF:
365 case BPF_KPTR_REF:
366 return __alignof__(u64);
367 case BPF_LIST_HEAD:
368 return __alignof__(struct bpf_list_head);
369 case BPF_LIST_NODE:
370 return __alignof__(struct bpf_list_node);
371 case BPF_RB_ROOT:
372 return __alignof__(struct bpf_rb_root);
373 case BPF_RB_NODE:
374 return __alignof__(struct bpf_rb_node);
375 case BPF_REFCOUNT:
376 return __alignof__(struct bpf_refcount);
377 default:
378 WARN_ON_ONCE(1);
379 return 0;
380 }
381 }
382
bpf_obj_init_field(const struct btf_field * field,void * addr)383 static inline void bpf_obj_init_field(const struct btf_field *field, void *addr)
384 {
385 memset(addr, 0, field->size);
386
387 switch (field->type) {
388 case BPF_REFCOUNT:
389 refcount_set((refcount_t *)addr, 1);
390 break;
391 case BPF_RB_NODE:
392 RB_CLEAR_NODE((struct rb_node *)addr);
393 break;
394 case BPF_LIST_HEAD:
395 case BPF_LIST_NODE:
396 INIT_LIST_HEAD((struct list_head *)addr);
397 break;
398 case BPF_RB_ROOT:
399 /* RB_ROOT_CACHED 0-inits, no need to do anything after memset */
400 case BPF_SPIN_LOCK:
401 case BPF_TIMER:
402 case BPF_KPTR_UNREF:
403 case BPF_KPTR_REF:
404 break;
405 default:
406 WARN_ON_ONCE(1);
407 return;
408 }
409 }
410
btf_record_has_field(const struct btf_record * rec,enum btf_field_type type)411 static inline bool btf_record_has_field(const struct btf_record *rec, enum btf_field_type type)
412 {
413 if (IS_ERR_OR_NULL(rec))
414 return false;
415 return rec->field_mask & type;
416 }
417
bpf_obj_init(const struct btf_record * rec,void * obj)418 static inline void bpf_obj_init(const struct btf_record *rec, void *obj)
419 {
420 int i;
421
422 if (IS_ERR_OR_NULL(rec))
423 return;
424 for (i = 0; i < rec->cnt; i++)
425 bpf_obj_init_field(&rec->fields[i], obj + rec->fields[i].offset);
426 }
427
428 /* 'dst' must be a temporary buffer and should not point to memory that is being
429 * used in parallel by a bpf program or bpf syscall, otherwise the access from
430 * the bpf program or bpf syscall may be corrupted by the reinitialization,
431 * leading to weird problems. Even 'dst' is newly-allocated from bpf memory
432 * allocator, it is still possible for 'dst' to be used in parallel by a bpf
433 * program or bpf syscall.
434 */
check_and_init_map_value(struct bpf_map * map,void * dst)435 static inline void check_and_init_map_value(struct bpf_map *map, void *dst)
436 {
437 bpf_obj_init(map->record, dst);
438 }
439
440 /* memcpy that is used with 8-byte aligned pointers, power-of-8 size and
441 * forced to use 'long' read/writes to try to atomically copy long counters.
442 * Best-effort only. No barriers here, since it _will_ race with concurrent
443 * updates from BPF programs. Called from bpf syscall and mostly used with
444 * size 8 or 16 bytes, so ask compiler to inline it.
445 */
bpf_long_memcpy(void * dst,const void * src,u32 size)446 static inline void bpf_long_memcpy(void *dst, const void *src, u32 size)
447 {
448 const long *lsrc = src;
449 long *ldst = dst;
450
451 size /= sizeof(long);
452 while (size--)
453 data_race(*ldst++ = *lsrc++);
454 }
455
456 /* copy everything but bpf_spin_lock, bpf_timer, and kptrs. There could be one of each. */
bpf_obj_memcpy(struct btf_record * rec,void * dst,void * src,u32 size,bool long_memcpy)457 static inline void bpf_obj_memcpy(struct btf_record *rec,
458 void *dst, void *src, u32 size,
459 bool long_memcpy)
460 {
461 u32 curr_off = 0;
462 int i;
463
464 if (IS_ERR_OR_NULL(rec)) {
465 if (long_memcpy)
466 bpf_long_memcpy(dst, src, round_up(size, 8));
467 else
468 memcpy(dst, src, size);
469 return;
470 }
471
472 for (i = 0; i < rec->cnt; i++) {
473 u32 next_off = rec->fields[i].offset;
474 u32 sz = next_off - curr_off;
475
476 memcpy(dst + curr_off, src + curr_off, sz);
477 curr_off += rec->fields[i].size + sz;
478 }
479 memcpy(dst + curr_off, src + curr_off, size - curr_off);
480 }
481
copy_map_value(struct bpf_map * map,void * dst,void * src)482 static inline void copy_map_value(struct bpf_map *map, void *dst, void *src)
483 {
484 bpf_obj_memcpy(map->record, dst, src, map->value_size, false);
485 }
486
copy_map_value_long(struct bpf_map * map,void * dst,void * src)487 static inline void copy_map_value_long(struct bpf_map *map, void *dst, void *src)
488 {
489 bpf_obj_memcpy(map->record, dst, src, map->value_size, true);
490 }
491
bpf_obj_memzero(struct btf_record * rec,void * dst,u32 size)492 static inline void bpf_obj_memzero(struct btf_record *rec, void *dst, u32 size)
493 {
494 u32 curr_off = 0;
495 int i;
496
497 if (IS_ERR_OR_NULL(rec)) {
498 memset(dst, 0, size);
499 return;
500 }
501
502 for (i = 0; i < rec->cnt; i++) {
503 u32 next_off = rec->fields[i].offset;
504 u32 sz = next_off - curr_off;
505
506 memset(dst + curr_off, 0, sz);
507 curr_off += rec->fields[i].size + sz;
508 }
509 memset(dst + curr_off, 0, size - curr_off);
510 }
511
zero_map_value(struct bpf_map * map,void * dst)512 static inline void zero_map_value(struct bpf_map *map, void *dst)
513 {
514 bpf_obj_memzero(map->record, dst, map->value_size);
515 }
516
517 void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
518 bool lock_src);
519 void bpf_timer_cancel_and_free(void *timer);
520 void bpf_list_head_free(const struct btf_field *field, void *list_head,
521 struct bpf_spin_lock *spin_lock);
522 void bpf_rb_root_free(const struct btf_field *field, void *rb_root,
523 struct bpf_spin_lock *spin_lock);
524
525
526 int bpf_obj_name_cpy(char *dst, const char *src, unsigned int size);
527
528 struct bpf_offload_dev;
529 struct bpf_offloaded_map;
530
531 struct bpf_map_dev_ops {
532 int (*map_get_next_key)(struct bpf_offloaded_map *map,
533 void *key, void *next_key);
534 int (*map_lookup_elem)(struct bpf_offloaded_map *map,
535 void *key, void *value);
536 int (*map_update_elem)(struct bpf_offloaded_map *map,
537 void *key, void *value, u64 flags);
538 int (*map_delete_elem)(struct bpf_offloaded_map *map, void *key);
539 };
540
541 struct bpf_offloaded_map {
542 struct bpf_map map;
543 struct net_device *netdev;
544 const struct bpf_map_dev_ops *dev_ops;
545 void *dev_priv;
546 struct list_head offloads;
547 };
548
map_to_offmap(struct bpf_map * map)549 static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
550 {
551 return container_of(map, struct bpf_offloaded_map, map);
552 }
553
bpf_map_offload_neutral(const struct bpf_map * map)554 static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
555 {
556 return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
557 }
558
bpf_map_support_seq_show(const struct bpf_map * map)559 static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
560 {
561 return (map->btf_value_type_id || map->btf_vmlinux_value_type_id) &&
562 map->ops->map_seq_show_elem;
563 }
564
565 int map_check_no_btf(const struct bpf_map *map,
566 const struct btf *btf,
567 const struct btf_type *key_type,
568 const struct btf_type *value_type);
569
570 bool bpf_map_meta_equal(const struct bpf_map *meta0,
571 const struct bpf_map *meta1);
572
573 extern const struct bpf_map_ops bpf_map_offload_ops;
574
575 /* bpf_type_flag contains a set of flags that are applicable to the values of
576 * arg_type, ret_type and reg_type. For example, a pointer value may be null,
577 * or a memory is read-only. We classify types into two categories: base types
578 * and extended types. Extended types are base types combined with a type flag.
579 *
580 * Currently there are no more than 32 base types in arg_type, ret_type and
581 * reg_types.
582 */
583 #define BPF_BASE_TYPE_BITS 8
584
585 enum bpf_type_flag {
586 /* PTR may be NULL. */
587 PTR_MAYBE_NULL = BIT(0 + BPF_BASE_TYPE_BITS),
588
589 /* MEM is read-only. When applied on bpf_arg, it indicates the arg is
590 * compatible with both mutable and immutable memory.
591 */
592 MEM_RDONLY = BIT(1 + BPF_BASE_TYPE_BITS),
593
594 /* MEM points to BPF ring buffer reservation. */
595 MEM_RINGBUF = BIT(2 + BPF_BASE_TYPE_BITS),
596
597 /* MEM is in user address space. */
598 MEM_USER = BIT(3 + BPF_BASE_TYPE_BITS),
599
600 /* MEM is a percpu memory. MEM_PERCPU tags PTR_TO_BTF_ID. When tagged
601 * with MEM_PERCPU, PTR_TO_BTF_ID _cannot_ be directly accessed. In
602 * order to drop this tag, it must be passed into bpf_per_cpu_ptr()
603 * or bpf_this_cpu_ptr(), which will return the pointer corresponding
604 * to the specified cpu.
605 */
606 MEM_PERCPU = BIT(4 + BPF_BASE_TYPE_BITS),
607
608 /* Indicates that the argument will be released. */
609 OBJ_RELEASE = BIT(5 + BPF_BASE_TYPE_BITS),
610
611 /* PTR is not trusted. This is only used with PTR_TO_BTF_ID, to mark
612 * unreferenced and referenced kptr loaded from map value using a load
613 * instruction, so that they can only be dereferenced but not escape the
614 * BPF program into the kernel (i.e. cannot be passed as arguments to
615 * kfunc or bpf helpers).
616 */
617 PTR_UNTRUSTED = BIT(6 + BPF_BASE_TYPE_BITS),
618
619 MEM_UNINIT = BIT(7 + BPF_BASE_TYPE_BITS),
620
621 /* DYNPTR points to memory local to the bpf program. */
622 DYNPTR_TYPE_LOCAL = BIT(8 + BPF_BASE_TYPE_BITS),
623
624 /* DYNPTR points to a kernel-produced ringbuf record. */
625 DYNPTR_TYPE_RINGBUF = BIT(9 + BPF_BASE_TYPE_BITS),
626
627 /* Size is known at compile time. */
628 MEM_FIXED_SIZE = BIT(10 + BPF_BASE_TYPE_BITS),
629
630 /* MEM is of an allocated object of type in program BTF. This is used to
631 * tag PTR_TO_BTF_ID allocated using bpf_obj_new.
632 */
633 MEM_ALLOC = BIT(11 + BPF_BASE_TYPE_BITS),
634
635 /* PTR was passed from the kernel in a trusted context, and may be
636 * passed to KF_TRUSTED_ARGS kfuncs or BPF helper functions.
637 * Confusingly, this is _not_ the opposite of PTR_UNTRUSTED above.
638 * PTR_UNTRUSTED refers to a kptr that was read directly from a map
639 * without invoking bpf_kptr_xchg(). What we really need to know is
640 * whether a pointer is safe to pass to a kfunc or BPF helper function.
641 * While PTR_UNTRUSTED pointers are unsafe to pass to kfuncs and BPF
642 * helpers, they do not cover all possible instances of unsafe
643 * pointers. For example, a pointer that was obtained from walking a
644 * struct will _not_ get the PTR_UNTRUSTED type modifier, despite the
645 * fact that it may be NULL, invalid, etc. This is due to backwards
646 * compatibility requirements, as this was the behavior that was first
647 * introduced when kptrs were added. The behavior is now considered
648 * deprecated, and PTR_UNTRUSTED will eventually be removed.
649 *
650 * PTR_TRUSTED, on the other hand, is a pointer that the kernel
651 * guarantees to be valid and safe to pass to kfuncs and BPF helpers.
652 * For example, pointers passed to tracepoint arguments are considered
653 * PTR_TRUSTED, as are pointers that are passed to struct_ops
654 * callbacks. As alluded to above, pointers that are obtained from
655 * walking PTR_TRUSTED pointers are _not_ trusted. For example, if a
656 * struct task_struct *task is PTR_TRUSTED, then accessing
657 * task->last_wakee will lose the PTR_TRUSTED modifier when it's stored
658 * in a BPF register. Similarly, pointers passed to certain programs
659 * types such as kretprobes are not guaranteed to be valid, as they may
660 * for example contain an object that was recently freed.
661 */
662 PTR_TRUSTED = BIT(12 + BPF_BASE_TYPE_BITS),
663
664 /* MEM is tagged with rcu and memory access needs rcu_read_lock protection. */
665 MEM_RCU = BIT(13 + BPF_BASE_TYPE_BITS),
666
667 /* Used to tag PTR_TO_BTF_ID | MEM_ALLOC references which are non-owning.
668 * Currently only valid for linked-list and rbtree nodes. If the nodes
669 * have a bpf_refcount_field, they must be tagged MEM_RCU as well.
670 */
671 NON_OWN_REF = BIT(14 + BPF_BASE_TYPE_BITS),
672
673 /* DYNPTR points to sk_buff */
674 DYNPTR_TYPE_SKB = BIT(15 + BPF_BASE_TYPE_BITS),
675
676 /* DYNPTR points to xdp_buff */
677 DYNPTR_TYPE_XDP = BIT(16 + BPF_BASE_TYPE_BITS),
678
679 /* Memory must be aligned on some architectures, used in combination with
680 * MEM_FIXED_SIZE.
681 */
682 MEM_ALIGNED = BIT(17 + BPF_BASE_TYPE_BITS),
683
684 __BPF_TYPE_FLAG_MAX,
685 __BPF_TYPE_LAST_FLAG = __BPF_TYPE_FLAG_MAX - 1,
686 };
687
688 #define DYNPTR_TYPE_FLAG_MASK (DYNPTR_TYPE_LOCAL | DYNPTR_TYPE_RINGBUF | DYNPTR_TYPE_SKB \
689 | DYNPTR_TYPE_XDP)
690
691 /* Max number of base types. */
692 #define BPF_BASE_TYPE_LIMIT (1UL << BPF_BASE_TYPE_BITS)
693
694 /* Max number of all types. */
695 #define BPF_TYPE_LIMIT (__BPF_TYPE_LAST_FLAG | (__BPF_TYPE_LAST_FLAG - 1))
696
697 /* function argument constraints */
698 enum bpf_arg_type {
699 ARG_DONTCARE = 0, /* unused argument in helper function */
700
701 /* the following constraints used to prototype
702 * bpf_map_lookup/update/delete_elem() functions
703 */
704 ARG_CONST_MAP_PTR, /* const argument used as pointer to bpf_map */
705 ARG_PTR_TO_MAP_KEY, /* pointer to stack used as map key */
706 ARG_PTR_TO_MAP_VALUE, /* pointer to stack used as map value */
707
708 /* Used to prototype bpf_memcmp() and other functions that access data
709 * on eBPF program stack
710 */
711 ARG_PTR_TO_MEM, /* pointer to valid memory (stack, packet, map value) */
712
713 ARG_CONST_SIZE, /* number of bytes accessed from memory */
714 ARG_CONST_SIZE_OR_ZERO, /* number of bytes accessed from memory or 0 */
715
716 ARG_PTR_TO_CTX, /* pointer to context */
717 ARG_ANYTHING, /* any (initialized) argument is ok */
718 ARG_PTR_TO_SPIN_LOCK, /* pointer to bpf_spin_lock */
719 ARG_PTR_TO_SOCK_COMMON, /* pointer to sock_common */
720 ARG_PTR_TO_SOCKET, /* pointer to bpf_sock (fullsock) */
721 ARG_PTR_TO_BTF_ID, /* pointer to in-kernel struct */
722 ARG_PTR_TO_RINGBUF_MEM, /* pointer to dynamically reserved ringbuf memory */
723 ARG_CONST_ALLOC_SIZE_OR_ZERO, /* number of allocated bytes requested */
724 ARG_PTR_TO_BTF_ID_SOCK_COMMON, /* pointer to in-kernel sock_common or bpf-mirrored bpf_sock */
725 ARG_PTR_TO_PERCPU_BTF_ID, /* pointer to in-kernel percpu type */
726 ARG_PTR_TO_FUNC, /* pointer to a bpf program function */
727 ARG_PTR_TO_STACK, /* pointer to stack */
728 ARG_PTR_TO_CONST_STR, /* pointer to a null terminated read-only string */
729 ARG_PTR_TO_TIMER, /* pointer to bpf_timer */
730 ARG_PTR_TO_KPTR, /* pointer to referenced kptr */
731 ARG_PTR_TO_DYNPTR, /* pointer to bpf_dynptr. See bpf_type_flag for dynptr type */
732 __BPF_ARG_TYPE_MAX,
733
734 /* Extended arg_types. */
735 ARG_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MAP_VALUE,
736 ARG_PTR_TO_MEM_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_MEM,
737 ARG_PTR_TO_CTX_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_CTX,
738 ARG_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_SOCKET,
739 ARG_PTR_TO_STACK_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_STACK,
740 ARG_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID,
741 /* pointer to memory does not need to be initialized, helper function must fill
742 * all bytes or clear them in error case.
743 */
744 ARG_PTR_TO_UNINIT_MEM = MEM_UNINIT | ARG_PTR_TO_MEM,
745 /* Pointer to valid memory of size known at compile time. */
746 ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
747
748 /* This must be the last entry. Its purpose is to ensure the enum is
749 * wide enough to hold the higher bits reserved for bpf_type_flag.
750 */
751 __BPF_ARG_TYPE_LIMIT = BPF_TYPE_LIMIT,
752 };
753 static_assert(__BPF_ARG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
754
755 /* type of values returned from helper functions */
756 enum bpf_return_type {
757 RET_INTEGER, /* function returns integer */
758 RET_VOID, /* function doesn't return anything */
759 RET_PTR_TO_MAP_VALUE, /* returns a pointer to map elem value */
760 RET_PTR_TO_SOCKET, /* returns a pointer to a socket */
761 RET_PTR_TO_TCP_SOCK, /* returns a pointer to a tcp_sock */
762 RET_PTR_TO_SOCK_COMMON, /* returns a pointer to a sock_common */
763 RET_PTR_TO_MEM, /* returns a pointer to memory */
764 RET_PTR_TO_MEM_OR_BTF_ID, /* returns a pointer to a valid memory or a btf_id */
765 RET_PTR_TO_BTF_ID, /* returns a pointer to a btf_id */
766 __BPF_RET_TYPE_MAX,
767
768 /* Extended ret_types. */
769 RET_PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MAP_VALUE,
770 RET_PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCKET,
771 RET_PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_TCP_SOCK,
772 RET_PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_SOCK_COMMON,
773 RET_PTR_TO_RINGBUF_MEM_OR_NULL = PTR_MAYBE_NULL | MEM_RINGBUF | RET_PTR_TO_MEM,
774 RET_PTR_TO_DYNPTR_MEM_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_MEM,
775 RET_PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | RET_PTR_TO_BTF_ID,
776 RET_PTR_TO_BTF_ID_TRUSTED = PTR_TRUSTED | RET_PTR_TO_BTF_ID,
777
778 /* This must be the last entry. Its purpose is to ensure the enum is
779 * wide enough to hold the higher bits reserved for bpf_type_flag.
780 */
781 __BPF_RET_TYPE_LIMIT = BPF_TYPE_LIMIT,
782 };
783 static_assert(__BPF_RET_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
784
785 /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
786 * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
787 * instructions after verifying
788 */
789 struct bpf_func_proto {
790 u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
791 bool gpl_only;
792 bool pkt_access;
793 bool might_sleep;
794 enum bpf_return_type ret_type;
795 union {
796 struct {
797 enum bpf_arg_type arg1_type;
798 enum bpf_arg_type arg2_type;
799 enum bpf_arg_type arg3_type;
800 enum bpf_arg_type arg4_type;
801 enum bpf_arg_type arg5_type;
802 };
803 enum bpf_arg_type arg_type[5];
804 };
805 union {
806 struct {
807 u32 *arg1_btf_id;
808 u32 *arg2_btf_id;
809 u32 *arg3_btf_id;
810 u32 *arg4_btf_id;
811 u32 *arg5_btf_id;
812 };
813 u32 *arg_btf_id[5];
814 struct {
815 size_t arg1_size;
816 size_t arg2_size;
817 size_t arg3_size;
818 size_t arg4_size;
819 size_t arg5_size;
820 };
821 size_t arg_size[5];
822 };
823 int *ret_btf_id; /* return value btf_id */
824 bool (*allowed)(const struct bpf_prog *prog);
825 };
826
827 /* bpf_context is intentionally undefined structure. Pointer to bpf_context is
828 * the first argument to eBPF programs.
829 * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
830 */
831 struct bpf_context;
832
833 enum bpf_access_type {
834 BPF_READ = 1,
835 BPF_WRITE = 2
836 };
837
838 /* types of values stored in eBPF registers */
839 /* Pointer types represent:
840 * pointer
841 * pointer + imm
842 * pointer + (u16) var
843 * pointer + (u16) var + imm
844 * if (range > 0) then [ptr, ptr + range - off) is safe to access
845 * if (id > 0) means that some 'var' was added
846 * if (off > 0) means that 'imm' was added
847 */
848 enum bpf_reg_type {
849 NOT_INIT = 0, /* nothing was written into register */
850 SCALAR_VALUE, /* reg doesn't contain a valid pointer */
851 PTR_TO_CTX, /* reg points to bpf_context */
852 CONST_PTR_TO_MAP, /* reg points to struct bpf_map */
853 PTR_TO_MAP_VALUE, /* reg points to map element value */
854 PTR_TO_MAP_KEY, /* reg points to a map element key */
855 PTR_TO_STACK, /* reg == frame_pointer + offset */
856 PTR_TO_PACKET_META, /* skb->data - meta_len */
857 PTR_TO_PACKET, /* reg points to skb->data */
858 PTR_TO_PACKET_END, /* skb->data + headlen */
859 PTR_TO_FLOW_KEYS, /* reg points to bpf_flow_keys */
860 PTR_TO_SOCKET, /* reg points to struct bpf_sock */
861 PTR_TO_SOCK_COMMON, /* reg points to sock_common */
862 PTR_TO_TCP_SOCK, /* reg points to struct tcp_sock */
863 PTR_TO_TP_BUFFER, /* reg points to a writable raw tp's buffer */
864 PTR_TO_XDP_SOCK, /* reg points to struct xdp_sock */
865 /* PTR_TO_BTF_ID points to a kernel struct that does not need
866 * to be null checked by the BPF program. This does not imply the
867 * pointer is _not_ null and in practice this can easily be a null
868 * pointer when reading pointer chains. The assumption is program
869 * context will handle null pointer dereference typically via fault
870 * handling. The verifier must keep this in mind and can make no
871 * assumptions about null or non-null when doing branch analysis.
872 * Further, when passed into helpers the helpers can not, without
873 * additional context, assume the value is non-null.
874 */
875 PTR_TO_BTF_ID,
876 /* PTR_TO_BTF_ID_OR_NULL points to a kernel struct that has not
877 * been checked for null. Used primarily to inform the verifier
878 * an explicit null check is required for this struct.
879 */
880 PTR_TO_MEM, /* reg points to valid memory region */
881 PTR_TO_BUF, /* reg points to a read/write buffer */
882 PTR_TO_FUNC, /* reg points to a bpf program function */
883 CONST_PTR_TO_DYNPTR, /* reg points to a const struct bpf_dynptr */
884 __BPF_REG_TYPE_MAX,
885
886 /* Extended reg_types. */
887 PTR_TO_MAP_VALUE_OR_NULL = PTR_MAYBE_NULL | PTR_TO_MAP_VALUE,
888 PTR_TO_SOCKET_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCKET,
889 PTR_TO_SOCK_COMMON_OR_NULL = PTR_MAYBE_NULL | PTR_TO_SOCK_COMMON,
890 PTR_TO_TCP_SOCK_OR_NULL = PTR_MAYBE_NULL | PTR_TO_TCP_SOCK,
891 PTR_TO_BTF_ID_OR_NULL = PTR_MAYBE_NULL | PTR_TO_BTF_ID,
892
893 /* This must be the last entry. Its purpose is to ensure the enum is
894 * wide enough to hold the higher bits reserved for bpf_type_flag.
895 */
896 __BPF_REG_TYPE_LIMIT = BPF_TYPE_LIMIT,
897 };
898 static_assert(__BPF_REG_TYPE_MAX <= BPF_BASE_TYPE_LIMIT);
899
900 /* The information passed from prog-specific *_is_valid_access
901 * back to the verifier.
902 */
903 struct bpf_insn_access_aux {
904 enum bpf_reg_type reg_type;
905 union {
906 int ctx_field_size;
907 struct {
908 struct btf *btf;
909 u32 btf_id;
910 };
911 };
912 struct bpf_verifier_log *log; /* for verbose logs */
913 };
914
915 static inline void
bpf_ctx_record_field_size(struct bpf_insn_access_aux * aux,u32 size)916 bpf_ctx_record_field_size(struct bpf_insn_access_aux *aux, u32 size)
917 {
918 aux->ctx_field_size = size;
919 }
920
bpf_is_ldimm64(const struct bpf_insn * insn)921 static bool bpf_is_ldimm64(const struct bpf_insn *insn)
922 {
923 return insn->code == (BPF_LD | BPF_IMM | BPF_DW);
924 }
925
bpf_pseudo_func(const struct bpf_insn * insn)926 static inline bool bpf_pseudo_func(const struct bpf_insn *insn)
927 {
928 return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC;
929 }
930
931 struct bpf_prog_ops {
932 int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr,
933 union bpf_attr __user *uattr);
934 };
935
936 struct bpf_reg_state;
937 struct bpf_verifier_ops {
938 /* return eBPF function prototype for verification */
939 const struct bpf_func_proto *
940 (*get_func_proto)(enum bpf_func_id func_id,
941 const struct bpf_prog *prog);
942
943 /* return true if 'size' wide access at offset 'off' within bpf_context
944 * with 'type' (read or write) is allowed
945 */
946 bool (*is_valid_access)(int off, int size, enum bpf_access_type type,
947 const struct bpf_prog *prog,
948 struct bpf_insn_access_aux *info);
949 int (*gen_prologue)(struct bpf_insn *insn, bool direct_write,
950 const struct bpf_prog *prog);
951 int (*gen_ld_abs)(const struct bpf_insn *orig,
952 struct bpf_insn *insn_buf);
953 u32 (*convert_ctx_access)(enum bpf_access_type type,
954 const struct bpf_insn *src,
955 struct bpf_insn *dst,
956 struct bpf_prog *prog, u32 *target_size);
957 int (*btf_struct_access)(struct bpf_verifier_log *log,
958 const struct bpf_reg_state *reg,
959 int off, int size);
960 };
961
962 struct bpf_prog_offload_ops {
963 /* verifier basic callbacks */
964 int (*insn_hook)(struct bpf_verifier_env *env,
965 int insn_idx, int prev_insn_idx);
966 int (*finalize)(struct bpf_verifier_env *env);
967 /* verifier optimization callbacks (called after .finalize) */
968 int (*replace_insn)(struct bpf_verifier_env *env, u32 off,
969 struct bpf_insn *insn);
970 int (*remove_insns)(struct bpf_verifier_env *env, u32 off, u32 cnt);
971 /* program management callbacks */
972 int (*prepare)(struct bpf_prog *prog);
973 int (*translate)(struct bpf_prog *prog);
974 void (*destroy)(struct bpf_prog *prog);
975 };
976
977 struct bpf_prog_offload {
978 struct bpf_prog *prog;
979 struct net_device *netdev;
980 struct bpf_offload_dev *offdev;
981 void *dev_priv;
982 struct list_head offloads;
983 bool dev_state;
984 bool opt_failed;
985 void *jited_image;
986 u32 jited_len;
987 };
988
989 enum bpf_cgroup_storage_type {
990 BPF_CGROUP_STORAGE_SHARED,
991 BPF_CGROUP_STORAGE_PERCPU,
992 __BPF_CGROUP_STORAGE_MAX
993 };
994
995 #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
996
997 /* The longest tracepoint has 12 args.
998 * See include/trace/bpf_probe.h
999 */
1000 #define MAX_BPF_FUNC_ARGS 12
1001
1002 /* The maximum number of arguments passed through registers
1003 * a single function may have.
1004 */
1005 #define MAX_BPF_FUNC_REG_ARGS 5
1006
1007 /* The argument is a structure. */
1008 #define BTF_FMODEL_STRUCT_ARG BIT(0)
1009
1010 /* The argument is signed. */
1011 #define BTF_FMODEL_SIGNED_ARG BIT(1)
1012
1013 struct btf_func_model {
1014 u8 ret_size;
1015 u8 ret_flags;
1016 u8 nr_args;
1017 u8 arg_size[MAX_BPF_FUNC_ARGS];
1018 u8 arg_flags[MAX_BPF_FUNC_ARGS];
1019 };
1020
1021 /* Restore arguments before returning from trampoline to let original function
1022 * continue executing. This flag is used for fentry progs when there are no
1023 * fexit progs.
1024 */
1025 #define BPF_TRAMP_F_RESTORE_REGS BIT(0)
1026 /* Call original function after fentry progs, but before fexit progs.
1027 * Makes sense for fentry/fexit, normal calls and indirect calls.
1028 */
1029 #define BPF_TRAMP_F_CALL_ORIG BIT(1)
1030 /* Skip current frame and return to parent. Makes sense for fentry/fexit
1031 * programs only. Should not be used with normal calls and indirect calls.
1032 */
1033 #define BPF_TRAMP_F_SKIP_FRAME BIT(2)
1034 /* Store IP address of the caller on the trampoline stack,
1035 * so it's available for trampoline's programs.
1036 */
1037 #define BPF_TRAMP_F_IP_ARG BIT(3)
1038 /* Return the return value of fentry prog. Only used by bpf_struct_ops. */
1039 #define BPF_TRAMP_F_RET_FENTRY_RET BIT(4)
1040
1041 /* Get original function from stack instead of from provided direct address.
1042 * Makes sense for trampolines with fexit or fmod_ret programs.
1043 */
1044 #define BPF_TRAMP_F_ORIG_STACK BIT(5)
1045
1046 /* This trampoline is on a function with another ftrace_ops with IPMODIFY,
1047 * e.g., a live patch. This flag is set and cleared by ftrace call backs,
1048 */
1049 #define BPF_TRAMP_F_SHARE_IPMODIFY BIT(6)
1050
1051 /* Indicate that current trampoline is in a tail call context. Then, it has to
1052 * cache and restore tail_call_cnt to avoid infinite tail call loop.
1053 */
1054 #define BPF_TRAMP_F_TAIL_CALL_CTX BIT(7)
1055
1056 /* Each call __bpf_prog_enter + call bpf_func + call __bpf_prog_exit is ~50
1057 * bytes on x86.
1058 */
1059 enum {
1060 #if defined(__s390x__)
1061 BPF_MAX_TRAMP_LINKS = 27,
1062 #else
1063 BPF_MAX_TRAMP_LINKS = 38,
1064 #endif
1065 };
1066
1067 struct bpf_tramp_links {
1068 struct bpf_tramp_link *links[BPF_MAX_TRAMP_LINKS];
1069 int nr_links;
1070 };
1071
1072 struct bpf_tramp_run_ctx;
1073
1074 /* Different use cases for BPF trampoline:
1075 * 1. replace nop at the function entry (kprobe equivalent)
1076 * flags = BPF_TRAMP_F_RESTORE_REGS
1077 * fentry = a set of programs to run before returning from trampoline
1078 *
1079 * 2. replace nop at the function entry (kprobe + kretprobe equivalent)
1080 * flags = BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_SKIP_FRAME
1081 * orig_call = fentry_ip + MCOUNT_INSN_SIZE
1082 * fentry = a set of program to run before calling original function
1083 * fexit = a set of program to run after original function
1084 *
1085 * 3. replace direct call instruction anywhere in the function body
1086 * or assign a function pointer for indirect call (like tcp_congestion_ops->cong_avoid)
1087 * With flags = 0
1088 * fentry = a set of programs to run before returning from trampoline
1089 * With flags = BPF_TRAMP_F_CALL_ORIG
1090 * orig_call = original callback addr or direct function addr
1091 * fentry = a set of program to run before calling original function
1092 * fexit = a set of program to run after original function
1093 */
1094 struct bpf_tramp_image;
1095 int arch_prepare_bpf_trampoline(struct bpf_tramp_image *tr, void *image, void *image_end,
1096 const struct btf_func_model *m, u32 flags,
1097 struct bpf_tramp_links *tlinks,
1098 void *orig_call);
1099 u64 notrace __bpf_prog_enter_sleepable_recur(struct bpf_prog *prog,
1100 struct bpf_tramp_run_ctx *run_ctx);
1101 void notrace __bpf_prog_exit_sleepable_recur(struct bpf_prog *prog, u64 start,
1102 struct bpf_tramp_run_ctx *run_ctx);
1103 void notrace __bpf_tramp_enter(struct bpf_tramp_image *tr);
1104 void notrace __bpf_tramp_exit(struct bpf_tramp_image *tr);
1105 typedef u64 (*bpf_trampoline_enter_t)(struct bpf_prog *prog,
1106 struct bpf_tramp_run_ctx *run_ctx);
1107 typedef void (*bpf_trampoline_exit_t)(struct bpf_prog *prog, u64 start,
1108 struct bpf_tramp_run_ctx *run_ctx);
1109 bpf_trampoline_enter_t bpf_trampoline_enter(const struct bpf_prog *prog);
1110 bpf_trampoline_exit_t bpf_trampoline_exit(const struct bpf_prog *prog);
1111
1112 struct bpf_ksym {
1113 unsigned long start;
1114 unsigned long end;
1115 char name[KSYM_NAME_LEN];
1116 struct list_head lnode;
1117 struct latch_tree_node tnode;
1118 bool prog;
1119 };
1120
1121 enum bpf_tramp_prog_type {
1122 BPF_TRAMP_FENTRY,
1123 BPF_TRAMP_FEXIT,
1124 BPF_TRAMP_MODIFY_RETURN,
1125 BPF_TRAMP_MAX,
1126 BPF_TRAMP_REPLACE, /* more than MAX */
1127 };
1128
1129 struct bpf_tramp_image {
1130 void *image;
1131 struct bpf_ksym ksym;
1132 struct percpu_ref pcref;
1133 void *ip_after_call;
1134 void *ip_epilogue;
1135 union {
1136 struct rcu_head rcu;
1137 struct work_struct work;
1138 };
1139 };
1140
1141 struct bpf_trampoline {
1142 /* hlist for trampoline_table */
1143 struct hlist_node hlist;
1144 struct ftrace_ops *fops;
1145 /* serializes access to fields of this trampoline */
1146 struct mutex mutex;
1147 refcount_t refcnt;
1148 u32 flags;
1149 u64 key;
1150 struct {
1151 struct btf_func_model model;
1152 void *addr;
1153 bool ftrace_managed;
1154 } func;
1155 /* if !NULL this is BPF_PROG_TYPE_EXT program that extends another BPF
1156 * program by replacing one of its functions. func.addr is the address
1157 * of the function it replaced.
1158 */
1159 struct bpf_prog *extension_prog;
1160 /* list of BPF programs using this trampoline */
1161 struct hlist_head progs_hlist[BPF_TRAMP_MAX];
1162 /* Number of attached programs. A counter per kind. */
1163 int progs_cnt[BPF_TRAMP_MAX];
1164 /* Executable image of trampoline */
1165 struct bpf_tramp_image *cur_image;
1166 struct module *mod;
1167 };
1168
1169 struct bpf_attach_target_info {
1170 struct btf_func_model fmodel;
1171 long tgt_addr;
1172 struct module *tgt_mod;
1173 const char *tgt_name;
1174 const struct btf_type *tgt_type;
1175 };
1176
1177 #define BPF_DISPATCHER_MAX 48 /* Fits in 2048B */
1178
1179 struct bpf_dispatcher_prog {
1180 struct bpf_prog *prog;
1181 refcount_t users;
1182 };
1183
1184 struct bpf_dispatcher {
1185 /* dispatcher mutex */
1186 struct mutex mutex;
1187 void *func;
1188 struct bpf_dispatcher_prog progs[BPF_DISPATCHER_MAX];
1189 int num_progs;
1190 void *image;
1191 void *rw_image;
1192 u32 image_off;
1193 struct bpf_ksym ksym;
1194 #ifdef CONFIG_HAVE_STATIC_CALL
1195 struct static_call_key *sc_key;
1196 void *sc_tramp;
1197 #endif
1198 };
1199
bpf_dispatcher_nop_func(const void * ctx,const struct bpf_insn * insnsi,bpf_func_t bpf_func)1200 static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func(
1201 const void *ctx,
1202 const struct bpf_insn *insnsi,
1203 bpf_func_t bpf_func)
1204 {
1205 return bpf_func(ctx, insnsi);
1206 }
1207
1208 /* the implementation of the opaque uapi struct bpf_dynptr */
1209 struct bpf_dynptr_kern {
1210 void *data;
1211 /* Size represents the number of usable bytes of dynptr data.
1212 * If for example the offset is at 4 for a local dynptr whose data is
1213 * of type u64, the number of usable bytes is 4.
1214 *
1215 * The upper 8 bits are reserved. It is as follows:
1216 * Bits 0 - 23 = size
1217 * Bits 24 - 30 = dynptr type
1218 * Bit 31 = whether dynptr is read-only
1219 */
1220 u32 size;
1221 u32 offset;
1222 } __aligned(8);
1223
1224 enum bpf_dynptr_type {
1225 BPF_DYNPTR_TYPE_INVALID,
1226 /* Points to memory that is local to the bpf program */
1227 BPF_DYNPTR_TYPE_LOCAL,
1228 /* Underlying data is a ringbuf record */
1229 BPF_DYNPTR_TYPE_RINGBUF,
1230 /* Underlying data is a sk_buff */
1231 BPF_DYNPTR_TYPE_SKB,
1232 /* Underlying data is a xdp_buff */
1233 BPF_DYNPTR_TYPE_XDP,
1234 };
1235
1236 int bpf_dynptr_check_size(u32 size);
1237 u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
1238
1239 #ifdef CONFIG_BPF_JIT
1240 int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1241 int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
1242 struct bpf_trampoline *bpf_trampoline_get(u64 key,
1243 struct bpf_attach_target_info *tgt_info);
1244 void bpf_trampoline_put(struct bpf_trampoline *tr);
1245 int arch_prepare_bpf_dispatcher(void *image, void *buf, s64 *funcs, int num_funcs);
1246
1247 /*
1248 * When the architecture supports STATIC_CALL replace the bpf_dispatcher_fn
1249 * indirection with a direct call to the bpf program. If the architecture does
1250 * not have STATIC_CALL, avoid a double-indirection.
1251 */
1252 #ifdef CONFIG_HAVE_STATIC_CALL
1253
1254 #define __BPF_DISPATCHER_SC_INIT(_name) \
1255 .sc_key = &STATIC_CALL_KEY(_name), \
1256 .sc_tramp = STATIC_CALL_TRAMP_ADDR(_name),
1257
1258 #define __BPF_DISPATCHER_SC(name) \
1259 DEFINE_STATIC_CALL(bpf_dispatcher_##name##_call, bpf_dispatcher_nop_func)
1260
1261 #define __BPF_DISPATCHER_CALL(name) \
1262 static_call(bpf_dispatcher_##name##_call)(ctx, insnsi, bpf_func)
1263
1264 #define __BPF_DISPATCHER_UPDATE(_d, _new) \
1265 __static_call_update((_d)->sc_key, (_d)->sc_tramp, (_new))
1266
1267 #else
1268 #define __BPF_DISPATCHER_SC_INIT(name)
1269 #define __BPF_DISPATCHER_SC(name)
1270 #define __BPF_DISPATCHER_CALL(name) bpf_func(ctx, insnsi)
1271 #define __BPF_DISPATCHER_UPDATE(_d, _new)
1272 #endif
1273
1274 #define BPF_DISPATCHER_INIT(_name) { \
1275 .mutex = __MUTEX_INITIALIZER(_name.mutex), \
1276 .func = &_name##_func, \
1277 .progs = {}, \
1278 .num_progs = 0, \
1279 .image = NULL, \
1280 .image_off = 0, \
1281 .ksym = { \
1282 .name = #_name, \
1283 .lnode = LIST_HEAD_INIT(_name.ksym.lnode), \
1284 }, \
1285 __BPF_DISPATCHER_SC_INIT(_name##_call) \
1286 }
1287
1288 #define DEFINE_BPF_DISPATCHER(name) \
1289 __BPF_DISPATCHER_SC(name); \
1290 noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \
1291 const void *ctx, \
1292 const struct bpf_insn *insnsi, \
1293 bpf_func_t bpf_func) \
1294 { \
1295 return __BPF_DISPATCHER_CALL(name); \
1296 } \
1297 EXPORT_SYMBOL(bpf_dispatcher_##name##_func); \
1298 struct bpf_dispatcher bpf_dispatcher_##name = \
1299 BPF_DISPATCHER_INIT(bpf_dispatcher_##name);
1300
1301 #define DECLARE_BPF_DISPATCHER(name) \
1302 unsigned int bpf_dispatcher_##name##_func( \
1303 const void *ctx, \
1304 const struct bpf_insn *insnsi, \
1305 bpf_func_t bpf_func); \
1306 extern struct bpf_dispatcher bpf_dispatcher_##name;
1307
1308 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_##name##_func
1309 #define BPF_DISPATCHER_PTR(name) (&bpf_dispatcher_##name)
1310 void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from,
1311 struct bpf_prog *to);
1312 /* Called only from JIT-enabled code, so there's no need for stubs. */
1313 void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
1314 void bpf_image_ksym_del(struct bpf_ksym *ksym);
1315 void bpf_ksym_add(struct bpf_ksym *ksym);
1316 void bpf_ksym_del(struct bpf_ksym *ksym);
1317 int bpf_jit_charge_modmem(u32 size);
1318 void bpf_jit_uncharge_modmem(u32 size);
1319 bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
1320 #else
bpf_trampoline_link_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1321 static inline int bpf_trampoline_link_prog(struct bpf_tramp_link *link,
1322 struct bpf_trampoline *tr)
1323 {
1324 return -ENOTSUPP;
1325 }
bpf_trampoline_unlink_prog(struct bpf_tramp_link * link,struct bpf_trampoline * tr)1326 static inline int bpf_trampoline_unlink_prog(struct bpf_tramp_link *link,
1327 struct bpf_trampoline *tr)
1328 {
1329 return -ENOTSUPP;
1330 }
bpf_trampoline_get(u64 key,struct bpf_attach_target_info * tgt_info)1331 static inline struct bpf_trampoline *bpf_trampoline_get(u64 key,
1332 struct bpf_attach_target_info *tgt_info)
1333 {
1334 return NULL;
1335 }
bpf_trampoline_put(struct bpf_trampoline * tr)1336 static inline void bpf_trampoline_put(struct bpf_trampoline *tr) {}
1337 #define DEFINE_BPF_DISPATCHER(name)
1338 #define DECLARE_BPF_DISPATCHER(name)
1339 #define BPF_DISPATCHER_FUNC(name) bpf_dispatcher_nop_func
1340 #define BPF_DISPATCHER_PTR(name) NULL
bpf_dispatcher_change_prog(struct bpf_dispatcher * d,struct bpf_prog * from,struct bpf_prog * to)1341 static inline void bpf_dispatcher_change_prog(struct bpf_dispatcher *d,
1342 struct bpf_prog *from,
1343 struct bpf_prog *to) {}
is_bpf_image_address(unsigned long address)1344 static inline bool is_bpf_image_address(unsigned long address)
1345 {
1346 return false;
1347 }
bpf_prog_has_trampoline(const struct bpf_prog * prog)1348 static inline bool bpf_prog_has_trampoline(const struct bpf_prog *prog)
1349 {
1350 return false;
1351 }
1352 #endif
1353
1354 struct bpf_func_info_aux {
1355 u16 linkage;
1356 bool unreliable;
1357 };
1358
1359 enum bpf_jit_poke_reason {
1360 BPF_POKE_REASON_TAIL_CALL,
1361 };
1362
1363 /* Descriptor of pokes pointing /into/ the JITed image. */
1364 struct bpf_jit_poke_descriptor {
1365 void *tailcall_target;
1366 void *tailcall_bypass;
1367 void *bypass_addr;
1368 void *aux;
1369 union {
1370 struct {
1371 struct bpf_map *map;
1372 u32 key;
1373 } tail_call;
1374 };
1375 bool tailcall_target_stable;
1376 u8 adj_off;
1377 u16 reason;
1378 u32 insn_idx;
1379 };
1380
1381 /* reg_type info for ctx arguments */
1382 struct bpf_ctx_arg_aux {
1383 u32 offset;
1384 enum bpf_reg_type reg_type;
1385 u32 btf_id;
1386 };
1387
1388 struct btf_mod_pair {
1389 struct btf *btf;
1390 struct module *module;
1391 };
1392
1393 struct bpf_kfunc_desc_tab;
1394
1395 struct bpf_prog_aux {
1396 atomic64_t refcnt;
1397 u32 used_map_cnt;
1398 u32 used_btf_cnt;
1399 u32 max_ctx_offset;
1400 u32 max_pkt_offset;
1401 u32 max_tp_access;
1402 u32 stack_depth;
1403 u32 id;
1404 u32 func_cnt; /* used by non-func prog as the number of func progs */
1405 u32 func_idx; /* 0 for non-func prog, the index in func array for func prog */
1406 u32 attach_btf_id; /* in-kernel BTF type id to attach to */
1407 u32 ctx_arg_info_size;
1408 u32 max_rdonly_access;
1409 u32 max_rdwr_access;
1410 struct btf *attach_btf;
1411 const struct bpf_ctx_arg_aux *ctx_arg_info;
1412 struct mutex dst_mutex; /* protects dst_* pointers below, *after* prog becomes visible */
1413 struct bpf_prog *dst_prog;
1414 struct bpf_trampoline *dst_trampoline;
1415 enum bpf_prog_type saved_dst_prog_type;
1416 enum bpf_attach_type saved_dst_attach_type;
1417 bool verifier_zext; /* Zero extensions has been inserted by verifier. */
1418 bool dev_bound; /* Program is bound to the netdev. */
1419 bool offload_requested; /* Program is bound and offloaded to the netdev. */
1420 bool attach_btf_trace; /* true if attaching to BTF-enabled raw tp */
1421 bool func_proto_unreliable;
1422 bool sleepable;
1423 bool tail_call_reachable;
1424 bool xdp_has_frags;
1425 /* BTF_KIND_FUNC_PROTO for valid attach_btf_id */
1426 const struct btf_type *attach_func_proto;
1427 /* function name for valid attach_btf_id */
1428 const char *attach_func_name;
1429 struct bpf_prog **func;
1430 void *jit_data; /* JIT specific data. arch dependent */
1431 struct bpf_jit_poke_descriptor *poke_tab;
1432 struct bpf_kfunc_desc_tab *kfunc_tab;
1433 struct bpf_kfunc_btf_tab *kfunc_btf_tab;
1434 u32 size_poke_tab;
1435 struct bpf_ksym ksym;
1436 const struct bpf_prog_ops *ops;
1437 struct bpf_map **used_maps;
1438 struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */
1439 struct btf_mod_pair *used_btfs;
1440 struct bpf_prog *prog;
1441 struct user_struct *user;
1442 u64 load_time; /* ns since boottime */
1443 u32 verified_insns;
1444 int cgroup_atype; /* enum cgroup_bpf_attach_type */
1445 struct bpf_map *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1446 char name[BPF_OBJ_NAME_LEN];
1447 #ifdef CONFIG_SECURITY
1448 void *security;
1449 #endif
1450 struct bpf_prog_offload *offload;
1451 struct btf *btf;
1452 struct bpf_func_info *func_info;
1453 struct bpf_func_info_aux *func_info_aux;
1454 /* bpf_line_info loaded from userspace. linfo->insn_off
1455 * has the xlated insn offset.
1456 * Both the main and sub prog share the same linfo.
1457 * The subprog can access its first linfo by
1458 * using the linfo_idx.
1459 */
1460 struct bpf_line_info *linfo;
1461 /* jited_linfo is the jited addr of the linfo. It has a
1462 * one to one mapping to linfo:
1463 * jited_linfo[i] is the jited addr for the linfo[i]->insn_off.
1464 * Both the main and sub prog share the same jited_linfo.
1465 * The subprog can access its first jited_linfo by
1466 * using the linfo_idx.
1467 */
1468 void **jited_linfo;
1469 u32 func_info_cnt;
1470 u32 nr_linfo;
1471 /* subprog can use linfo_idx to access its first linfo and
1472 * jited_linfo.
1473 * main prog always has linfo_idx == 0
1474 */
1475 u32 linfo_idx;
1476 struct module *mod;
1477 u32 num_exentries;
1478 struct exception_table_entry *extable;
1479 union {
1480 struct work_struct work;
1481 struct rcu_head rcu;
1482 };
1483 };
1484
1485 struct bpf_prog {
1486 u16 pages; /* Number of allocated pages */
1487 u16 jited:1, /* Is our filter JIT'ed? */
1488 jit_requested:1,/* archs need to JIT the prog */
1489 gpl_compatible:1, /* Is filter GPL compatible? */
1490 cb_access:1, /* Is control block accessed? */
1491 dst_needed:1, /* Do we need dst entry? */
1492 blinding_requested:1, /* needs constant blinding */
1493 blinded:1, /* Was blinded */
1494 is_func:1, /* program is a bpf function */
1495 kprobe_override:1, /* Do we override a kprobe? */
1496 has_callchain_buf:1, /* callchain buffer allocated? */
1497 enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
1498 call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
1499 call_get_func_ip:1, /* Do we call get_func_ip() */
1500 tstamp_type_access:1; /* Accessed __sk_buff->tstamp_type */
1501 enum bpf_prog_type type; /* Type of BPF program */
1502 enum bpf_attach_type expected_attach_type; /* For some prog types */
1503 u32 len; /* Number of filter blocks */
1504 u32 jited_len; /* Size of jited insns in bytes */
1505 u8 tag[BPF_TAG_SIZE];
1506 struct bpf_prog_stats __percpu *stats;
1507 int __percpu *active;
1508 unsigned int (*bpf_func)(const void *ctx,
1509 const struct bpf_insn *insn);
1510 struct bpf_prog_aux *aux; /* Auxiliary fields */
1511 struct sock_fprog_kern *orig_prog; /* Original BPF program */
1512 /* Instructions for interpreter */
1513 union {
1514 DECLARE_FLEX_ARRAY(struct sock_filter, insns);
1515 DECLARE_FLEX_ARRAY(struct bpf_insn, insnsi);
1516 };
1517 };
1518
1519 struct bpf_array_aux {
1520 /* Programs with direct jumps into programs part of this array. */
1521 struct list_head poke_progs;
1522 struct bpf_map *map;
1523 struct mutex poke_mutex;
1524 struct work_struct work;
1525 };
1526
1527 struct bpf_link {
1528 atomic64_t refcnt;
1529 u32 id;
1530 enum bpf_link_type type;
1531 const struct bpf_link_ops *ops;
1532 struct bpf_prog *prog;
1533 /* rcu is used before freeing, work can be used to schedule that
1534 * RCU-based freeing before that, so they never overlap
1535 */
1536 union {
1537 struct rcu_head rcu;
1538 struct work_struct work;
1539 };
1540 };
1541
1542 struct bpf_link_ops {
1543 void (*release)(struct bpf_link *link);
1544 /* deallocate link resources callback, called without RCU grace period
1545 * waiting
1546 */
1547 void (*dealloc)(struct bpf_link *link);
1548 /* deallocate link resources callback, called after RCU grace period;
1549 * if underlying BPF program is sleepable we go through tasks trace
1550 * RCU GP and then "classic" RCU GP
1551 */
1552 void (*dealloc_deferred)(struct bpf_link *link);
1553 int (*detach)(struct bpf_link *link);
1554 int (*update_prog)(struct bpf_link *link, struct bpf_prog *new_prog,
1555 struct bpf_prog *old_prog);
1556 void (*show_fdinfo)(const struct bpf_link *link, struct seq_file *seq);
1557 int (*fill_link_info)(const struct bpf_link *link,
1558 struct bpf_link_info *info);
1559 int (*update_map)(struct bpf_link *link, struct bpf_map *new_map,
1560 struct bpf_map *old_map);
1561 };
1562
1563 struct bpf_tramp_link {
1564 struct bpf_link link;
1565 struct hlist_node tramp_hlist;
1566 u64 cookie;
1567 };
1568
1569 struct bpf_shim_tramp_link {
1570 struct bpf_tramp_link link;
1571 struct bpf_trampoline *trampoline;
1572 };
1573
1574 struct bpf_tracing_link {
1575 struct bpf_tramp_link link;
1576 enum bpf_attach_type attach_type;
1577 struct bpf_trampoline *trampoline;
1578 struct bpf_prog *tgt_prog;
1579 };
1580
1581 struct bpf_link_primer {
1582 struct bpf_link *link;
1583 struct file *file;
1584 int fd;
1585 u32 id;
1586 };
1587
1588 struct bpf_struct_ops_value;
1589 struct btf_member;
1590
1591 #define BPF_STRUCT_OPS_MAX_NR_MEMBERS 64
1592 /**
1593 * struct bpf_struct_ops - A structure of callbacks allowing a subsystem to
1594 * define a BPF_MAP_TYPE_STRUCT_OPS map type composed
1595 * of BPF_PROG_TYPE_STRUCT_OPS progs.
1596 * @verifier_ops: A structure of callbacks that are invoked by the verifier
1597 * when determining whether the struct_ops progs in the
1598 * struct_ops map are valid.
1599 * @init: A callback that is invoked a single time, and before any other
1600 * callback, to initialize the structure. A nonzero return value means
1601 * the subsystem could not be initialized.
1602 * @check_member: When defined, a callback invoked by the verifier to allow
1603 * the subsystem to determine if an entry in the struct_ops map
1604 * is valid. A nonzero return value means that the map is
1605 * invalid and should be rejected by the verifier.
1606 * @init_member: A callback that is invoked for each member of the struct_ops
1607 * map to allow the subsystem to initialize the member. A nonzero
1608 * value means the member could not be initialized. This callback
1609 * is exclusive with the @type, @type_id, @value_type, and
1610 * @value_id fields.
1611 * @reg: A callback that is invoked when the struct_ops map has been
1612 * initialized and is being attached to. Zero means the struct_ops map
1613 * has been successfully registered and is live. A nonzero return value
1614 * means the struct_ops map could not be registered.
1615 * @unreg: A callback that is invoked when the struct_ops map should be
1616 * unregistered.
1617 * @update: A callback that is invoked when the live struct_ops map is being
1618 * updated to contain new values. This callback is only invoked when
1619 * the struct_ops map is loaded with BPF_F_LINK. If not defined, the
1620 * it is assumed that the struct_ops map cannot be updated.
1621 * @validate: A callback that is invoked after all of the members have been
1622 * initialized. This callback should perform static checks on the
1623 * map, meaning that it should either fail or succeed
1624 * deterministically. A struct_ops map that has been validated may
1625 * not necessarily succeed in being registered if the call to @reg
1626 * fails. For example, a valid struct_ops map may be loaded, but
1627 * then fail to be registered due to there being another active
1628 * struct_ops map on the system in the subsystem already. For this
1629 * reason, if this callback is not defined, the check is skipped as
1630 * the struct_ops map will have final verification performed in
1631 * @reg.
1632 * @type: BTF type.
1633 * @value_type: Value type.
1634 * @name: The name of the struct bpf_struct_ops object.
1635 * @func_models: Func models
1636 * @type_id: BTF type id.
1637 * @value_id: BTF value id.
1638 */
1639 struct bpf_struct_ops {
1640 const struct bpf_verifier_ops *verifier_ops;
1641 int (*init)(struct btf *btf);
1642 int (*check_member)(const struct btf_type *t,
1643 const struct btf_member *member,
1644 const struct bpf_prog *prog);
1645 int (*init_member)(const struct btf_type *t,
1646 const struct btf_member *member,
1647 void *kdata, const void *udata);
1648 int (*reg)(void *kdata);
1649 void (*unreg)(void *kdata);
1650 int (*update)(void *kdata, void *old_kdata);
1651 int (*validate)(void *kdata);
1652 const struct btf_type *type;
1653 const struct btf_type *value_type;
1654 const char *name;
1655 struct btf_func_model func_models[BPF_STRUCT_OPS_MAX_NR_MEMBERS];
1656 u32 type_id;
1657 u32 value_id;
1658 };
1659
1660 #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
1661 #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + POISON_POINTER_DELTA))
1662 const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id);
1663 void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
1664 bool bpf_struct_ops_get(const void *kdata);
1665 void bpf_struct_ops_put(const void *kdata);
1666 int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
1667 void *value);
1668 int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
1669 struct bpf_tramp_link *link,
1670 const struct btf_func_model *model,
1671 void *image, void *image_end);
bpf_try_module_get(const void * data,struct module * owner)1672 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1673 {
1674 if (owner == BPF_MODULE_OWNER)
1675 return bpf_struct_ops_get(data);
1676 else
1677 return try_module_get(owner);
1678 }
bpf_module_put(const void * data,struct module * owner)1679 static inline void bpf_module_put(const void *data, struct module *owner)
1680 {
1681 if (owner == BPF_MODULE_OWNER)
1682 bpf_struct_ops_put(data);
1683 else
1684 module_put(owner);
1685 }
1686 int bpf_struct_ops_link_create(union bpf_attr *attr);
1687
1688 #ifdef CONFIG_NET
1689 /* Define it here to avoid the use of forward declaration */
1690 struct bpf_dummy_ops_state {
1691 int val;
1692 };
1693
1694 struct bpf_dummy_ops {
1695 int (*test_1)(struct bpf_dummy_ops_state *cb);
1696 int (*test_2)(struct bpf_dummy_ops_state *cb, int a1, unsigned short a2,
1697 char a3, unsigned long a4);
1698 int (*test_sleepable)(struct bpf_dummy_ops_state *cb);
1699 };
1700
1701 int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
1702 union bpf_attr __user *uattr);
1703 #endif
1704 #else
bpf_struct_ops_find(u32 type_id)1705 static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
1706 {
1707 return NULL;
1708 }
bpf_struct_ops_init(struct btf * btf,struct bpf_verifier_log * log)1709 static inline void bpf_struct_ops_init(struct btf *btf,
1710 struct bpf_verifier_log *log)
1711 {
1712 }
bpf_try_module_get(const void * data,struct module * owner)1713 static inline bool bpf_try_module_get(const void *data, struct module *owner)
1714 {
1715 return try_module_get(owner);
1716 }
bpf_module_put(const void * data,struct module * owner)1717 static inline void bpf_module_put(const void *data, struct module *owner)
1718 {
1719 module_put(owner);
1720 }
bpf_struct_ops_map_sys_lookup_elem(struct bpf_map * map,void * key,void * value)1721 static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
1722 void *key,
1723 void *value)
1724 {
1725 return -EINVAL;
1726 }
bpf_struct_ops_link_create(union bpf_attr * attr)1727 static inline int bpf_struct_ops_link_create(union bpf_attr *attr)
1728 {
1729 return -EOPNOTSUPP;
1730 }
1731
1732 #endif
1733
1734 #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
1735 int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1736 int cgroup_atype);
1737 void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
1738 #else
bpf_trampoline_link_cgroup_shim(struct bpf_prog * prog,int cgroup_atype)1739 static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
1740 int cgroup_atype)
1741 {
1742 return -EOPNOTSUPP;
1743 }
bpf_trampoline_unlink_cgroup_shim(struct bpf_prog * prog)1744 static inline void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
1745 {
1746 }
1747 #endif
1748
1749 struct bpf_array {
1750 struct bpf_map map;
1751 u32 elem_size;
1752 u32 index_mask;
1753 struct bpf_array_aux *aux;
1754 union {
1755 DECLARE_FLEX_ARRAY(char, value) __aligned(8);
1756 DECLARE_FLEX_ARRAY(void *, ptrs) __aligned(8);
1757 DECLARE_FLEX_ARRAY(void __percpu *, pptrs) __aligned(8);
1758 };
1759 };
1760
1761 #define BPF_COMPLEXITY_LIMIT_INSNS 1000000 /* yes. 1M insns */
1762 #define MAX_TAIL_CALL_CNT 33
1763
1764 /* Maximum number of loops for bpf_loop and bpf_iter_num.
1765 * It's enum to expose it (and thus make it discoverable) through BTF.
1766 */
1767 enum {
1768 BPF_MAX_LOOPS = 8 * 1024 * 1024,
1769 };
1770
1771 #define BPF_F_ACCESS_MASK (BPF_F_RDONLY | \
1772 BPF_F_RDONLY_PROG | \
1773 BPF_F_WRONLY | \
1774 BPF_F_WRONLY_PROG)
1775
1776 #define BPF_MAP_CAN_READ BIT(0)
1777 #define BPF_MAP_CAN_WRITE BIT(1)
1778
1779 /* Maximum number of user-producer ring buffer samples that can be drained in
1780 * a call to bpf_user_ringbuf_drain().
1781 */
1782 #define BPF_MAX_USER_RINGBUF_SAMPLES (128 * 1024)
1783
bpf_map_flags_to_cap(struct bpf_map * map)1784 static inline u32 bpf_map_flags_to_cap(struct bpf_map *map)
1785 {
1786 u32 access_flags = map->map_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1787
1788 /* Combination of BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG is
1789 * not possible.
1790 */
1791 if (access_flags & BPF_F_RDONLY_PROG)
1792 return BPF_MAP_CAN_READ;
1793 else if (access_flags & BPF_F_WRONLY_PROG)
1794 return BPF_MAP_CAN_WRITE;
1795 else
1796 return BPF_MAP_CAN_READ | BPF_MAP_CAN_WRITE;
1797 }
1798
bpf_map_flags_access_ok(u32 access_flags)1799 static inline bool bpf_map_flags_access_ok(u32 access_flags)
1800 {
1801 return (access_flags & (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG)) !=
1802 (BPF_F_RDONLY_PROG | BPF_F_WRONLY_PROG);
1803 }
1804
1805 struct bpf_event_entry {
1806 struct perf_event *event;
1807 struct file *perf_file;
1808 struct file *map_file;
1809 struct rcu_head rcu;
1810 };
1811
map_type_contains_progs(struct bpf_map * map)1812 static inline bool map_type_contains_progs(struct bpf_map *map)
1813 {
1814 return map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
1815 map->map_type == BPF_MAP_TYPE_DEVMAP ||
1816 map->map_type == BPF_MAP_TYPE_CPUMAP;
1817 }
1818
1819 bool bpf_prog_map_compatible(struct bpf_map *map, const struct bpf_prog *fp);
1820 int bpf_prog_calc_tag(struct bpf_prog *fp);
1821
1822 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
1823 const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void);
1824
1825 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
1826 unsigned long off, unsigned long len);
1827 typedef u32 (*bpf_convert_ctx_access_t)(enum bpf_access_type type,
1828 const struct bpf_insn *src,
1829 struct bpf_insn *dst,
1830 struct bpf_prog *prog,
1831 u32 *target_size);
1832
1833 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size,
1834 void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy);
1835
1836 /* an array of programs to be executed under rcu_lock.
1837 *
1838 * Typical usage:
1839 * ret = bpf_prog_run_array(rcu_dereference(&bpf_prog_array), ctx, bpf_prog_run);
1840 *
1841 * the structure returned by bpf_prog_array_alloc() should be populated
1842 * with program pointers and the last pointer must be NULL.
1843 * The user has to keep refcnt on the program and make sure the program
1844 * is removed from the array before bpf_prog_put().
1845 * The 'struct bpf_prog_array *' should only be replaced with xchg()
1846 * since other cpus are walking the array of pointers in parallel.
1847 */
1848 struct bpf_prog_array_item {
1849 struct bpf_prog *prog;
1850 union {
1851 struct bpf_cgroup_storage *cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE];
1852 u64 bpf_cookie;
1853 };
1854 };
1855
1856 struct bpf_prog_array {
1857 struct rcu_head rcu;
1858 struct bpf_prog_array_item items[];
1859 };
1860
1861 struct bpf_empty_prog_array {
1862 struct bpf_prog_array hdr;
1863 struct bpf_prog *null_prog;
1864 };
1865
1866 /* to avoid allocating empty bpf_prog_array for cgroups that
1867 * don't have bpf program attached use one global 'bpf_empty_prog_array'
1868 * It will not be modified the caller of bpf_prog_array_alloc()
1869 * (since caller requested prog_cnt == 0)
1870 * that pointer should be 'freed' by bpf_prog_array_free()
1871 */
1872 extern struct bpf_empty_prog_array bpf_empty_prog_array;
1873
1874 struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
1875 void bpf_prog_array_free(struct bpf_prog_array *progs);
1876 /* Use when traversal over the bpf_prog_array uses tasks_trace rcu */
1877 void bpf_prog_array_free_sleepable(struct bpf_prog_array *progs);
1878 int bpf_prog_array_length(struct bpf_prog_array *progs);
1879 bool bpf_prog_array_is_empty(struct bpf_prog_array *array);
1880 int bpf_prog_array_copy_to_user(struct bpf_prog_array *progs,
1881 __u32 __user *prog_ids, u32 cnt);
1882
1883 void bpf_prog_array_delete_safe(struct bpf_prog_array *progs,
1884 struct bpf_prog *old_prog);
1885 int bpf_prog_array_delete_safe_at(struct bpf_prog_array *array, int index);
1886 int bpf_prog_array_update_at(struct bpf_prog_array *array, int index,
1887 struct bpf_prog *prog);
1888 int bpf_prog_array_copy_info(struct bpf_prog_array *array,
1889 u32 *prog_ids, u32 request_cnt,
1890 u32 *prog_cnt);
1891 int bpf_prog_array_copy(struct bpf_prog_array *old_array,
1892 struct bpf_prog *exclude_prog,
1893 struct bpf_prog *include_prog,
1894 u64 bpf_cookie,
1895 struct bpf_prog_array **new_array);
1896
1897 struct bpf_run_ctx {};
1898
1899 struct bpf_cg_run_ctx {
1900 struct bpf_run_ctx run_ctx;
1901 const struct bpf_prog_array_item *prog_item;
1902 int retval;
1903 };
1904
1905 struct bpf_trace_run_ctx {
1906 struct bpf_run_ctx run_ctx;
1907 u64 bpf_cookie;
1908 bool is_uprobe;
1909 };
1910
1911 struct bpf_tramp_run_ctx {
1912 struct bpf_run_ctx run_ctx;
1913 u64 bpf_cookie;
1914 struct bpf_run_ctx *saved_run_ctx;
1915 };
1916
bpf_set_run_ctx(struct bpf_run_ctx * new_ctx)1917 static inline struct bpf_run_ctx *bpf_set_run_ctx(struct bpf_run_ctx *new_ctx)
1918 {
1919 struct bpf_run_ctx *old_ctx = NULL;
1920
1921 #ifdef CONFIG_BPF_SYSCALL
1922 old_ctx = current->bpf_ctx;
1923 current->bpf_ctx = new_ctx;
1924 #endif
1925 return old_ctx;
1926 }
1927
bpf_reset_run_ctx(struct bpf_run_ctx * old_ctx)1928 static inline void bpf_reset_run_ctx(struct bpf_run_ctx *old_ctx)
1929 {
1930 #ifdef CONFIG_BPF_SYSCALL
1931 current->bpf_ctx = old_ctx;
1932 #endif
1933 }
1934
1935 /* BPF program asks to bypass CAP_NET_BIND_SERVICE in bind. */
1936 #define BPF_RET_BIND_NO_CAP_NET_BIND_SERVICE (1 << 0)
1937 /* BPF program asks to set CN on the packet. */
1938 #define BPF_RET_SET_CN (1 << 0)
1939
1940 typedef u32 (*bpf_prog_run_fn)(const struct bpf_prog *prog, const void *ctx);
1941
1942 static __always_inline u32
bpf_prog_run_array(const struct bpf_prog_array * array,const void * ctx,bpf_prog_run_fn run_prog)1943 bpf_prog_run_array(const struct bpf_prog_array *array,
1944 const void *ctx, bpf_prog_run_fn run_prog)
1945 {
1946 const struct bpf_prog_array_item *item;
1947 const struct bpf_prog *prog;
1948 struct bpf_run_ctx *old_run_ctx;
1949 struct bpf_trace_run_ctx run_ctx;
1950 u32 ret = 1;
1951
1952 RCU_LOCKDEP_WARN(!rcu_read_lock_held(), "no rcu lock held");
1953
1954 if (unlikely(!array))
1955 return ret;
1956
1957 run_ctx.is_uprobe = false;
1958
1959 migrate_disable();
1960 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
1961 item = &array->items[0];
1962 while ((prog = READ_ONCE(item->prog))) {
1963 run_ctx.bpf_cookie = item->bpf_cookie;
1964 ret &= run_prog(prog, ctx);
1965 item++;
1966 }
1967 bpf_reset_run_ctx(old_run_ctx);
1968 migrate_enable();
1969 return ret;
1970 }
1971
1972 /* Notes on RCU design for bpf_prog_arrays containing sleepable programs:
1973 *
1974 * We use the tasks_trace rcu flavor read section to protect the bpf_prog_array
1975 * overall. As a result, we must use the bpf_prog_array_free_sleepable
1976 * in order to use the tasks_trace rcu grace period.
1977 *
1978 * When a non-sleepable program is inside the array, we take the rcu read
1979 * section and disable preemption for that program alone, so it can access
1980 * rcu-protected dynamically sized maps.
1981 */
1982 static __always_inline u32
bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu * array_rcu,const void * ctx,bpf_prog_run_fn run_prog)1983 bpf_prog_run_array_uprobe(const struct bpf_prog_array __rcu *array_rcu,
1984 const void *ctx, bpf_prog_run_fn run_prog)
1985 {
1986 const struct bpf_prog_array_item *item;
1987 const struct bpf_prog *prog;
1988 const struct bpf_prog_array *array;
1989 struct bpf_run_ctx *old_run_ctx;
1990 struct bpf_trace_run_ctx run_ctx;
1991 u32 ret = 1;
1992
1993 might_fault();
1994
1995 rcu_read_lock_trace();
1996 migrate_disable();
1997
1998 run_ctx.is_uprobe = true;
1999
2000 array = rcu_dereference_check(array_rcu, rcu_read_lock_trace_held());
2001 if (unlikely(!array))
2002 goto out;
2003 old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
2004 item = &array->items[0];
2005 while ((prog = READ_ONCE(item->prog))) {
2006 if (!prog->aux->sleepable)
2007 rcu_read_lock();
2008
2009 run_ctx.bpf_cookie = item->bpf_cookie;
2010 ret &= run_prog(prog, ctx);
2011 item++;
2012
2013 if (!prog->aux->sleepable)
2014 rcu_read_unlock();
2015 }
2016 bpf_reset_run_ctx(old_run_ctx);
2017 out:
2018 migrate_enable();
2019 rcu_read_unlock_trace();
2020 return ret;
2021 }
2022
2023 #ifdef CONFIG_BPF_SYSCALL
2024 DECLARE_PER_CPU(int, bpf_prog_active);
2025 extern struct mutex bpf_stats_enabled_mutex;
2026
2027 /*
2028 * Block execution of BPF programs attached to instrumentation (perf,
2029 * kprobes, tracepoints) to prevent deadlocks on map operations as any of
2030 * these events can happen inside a region which holds a map bucket lock
2031 * and can deadlock on it.
2032 */
bpf_disable_instrumentation(void)2033 static inline void bpf_disable_instrumentation(void)
2034 {
2035 migrate_disable();
2036 this_cpu_inc(bpf_prog_active);
2037 }
2038
bpf_enable_instrumentation(void)2039 static inline void bpf_enable_instrumentation(void)
2040 {
2041 this_cpu_dec(bpf_prog_active);
2042 migrate_enable();
2043 }
2044
2045 extern const struct file_operations bpf_map_fops;
2046 extern const struct file_operations bpf_prog_fops;
2047 extern const struct file_operations bpf_iter_fops;
2048
2049 #define BPF_PROG_TYPE(_id, _name, prog_ctx_type, kern_ctx_type) \
2050 extern const struct bpf_prog_ops _name ## _prog_ops; \
2051 extern const struct bpf_verifier_ops _name ## _verifier_ops;
2052 #define BPF_MAP_TYPE(_id, _ops) \
2053 extern const struct bpf_map_ops _ops;
2054 #define BPF_LINK_TYPE(_id, _name)
2055 #include <linux/bpf_types.h>
2056 #undef BPF_PROG_TYPE
2057 #undef BPF_MAP_TYPE
2058 #undef BPF_LINK_TYPE
2059
2060 extern const struct bpf_prog_ops bpf_offload_prog_ops;
2061 extern const struct bpf_verifier_ops tc_cls_act_analyzer_ops;
2062 extern const struct bpf_verifier_ops xdp_analyzer_ops;
2063
2064 struct bpf_prog *bpf_prog_get(u32 ufd);
2065 struct bpf_prog *bpf_prog_get_type_dev(u32 ufd, enum bpf_prog_type type,
2066 bool attach_drv);
2067 void bpf_prog_add(struct bpf_prog *prog, int i);
2068 void bpf_prog_sub(struct bpf_prog *prog, int i);
2069 void bpf_prog_inc(struct bpf_prog *prog);
2070 struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
2071 void bpf_prog_put(struct bpf_prog *prog);
2072
2073 void bpf_prog_free_id(struct bpf_prog *prog);
2074 void bpf_map_free_id(struct bpf_map *map);
2075
2076 struct btf_field *btf_record_find(const struct btf_record *rec,
2077 u32 offset, u32 field_mask);
2078 void btf_record_free(struct btf_record *rec);
2079 void bpf_map_free_record(struct bpf_map *map);
2080 struct btf_record *btf_record_dup(const struct btf_record *rec);
2081 bool btf_record_equal(const struct btf_record *rec_a, const struct btf_record *rec_b);
2082 void bpf_obj_free_timer(const struct btf_record *rec, void *obj);
2083 void bpf_obj_free_fields(const struct btf_record *rec, void *obj);
2084
2085 struct bpf_map *bpf_map_get(u32 ufd);
2086 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
2087 struct bpf_map *__bpf_map_get(struct fd f);
2088 void bpf_map_inc(struct bpf_map *map);
2089 void bpf_map_inc_with_uref(struct bpf_map *map);
2090 struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref);
2091 struct bpf_map * __must_check bpf_map_inc_not_zero(struct bpf_map *map);
2092 void bpf_map_put_with_uref(struct bpf_map *map);
2093 void bpf_map_put(struct bpf_map *map);
2094 void *bpf_map_area_alloc(u64 size, int numa_node);
2095 void *bpf_map_area_mmapable_alloc(u64 size, int numa_node);
2096 void bpf_map_area_free(void *base);
2097 bool bpf_map_write_active(const struct bpf_map *map);
2098 void bpf_map_init_from_attr(struct bpf_map *map, union bpf_attr *attr);
2099 int generic_map_lookup_batch(struct bpf_map *map,
2100 const union bpf_attr *attr,
2101 union bpf_attr __user *uattr);
2102 int generic_map_update_batch(struct bpf_map *map, struct file *map_file,
2103 const union bpf_attr *attr,
2104 union bpf_attr __user *uattr);
2105 int generic_map_delete_batch(struct bpf_map *map,
2106 const union bpf_attr *attr,
2107 union bpf_attr __user *uattr);
2108 struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
2109 struct bpf_prog *bpf_prog_get_curr_or_next(u32 *id);
2110
2111 #ifdef CONFIG_MEMCG_KMEM
2112 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2113 int node);
2114 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
2115 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
2116 gfp_t flags);
2117 void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
2118 size_t align, gfp_t flags);
2119 #else
2120 static inline void *
bpf_map_kmalloc_node(const struct bpf_map * map,size_t size,gfp_t flags,int node)2121 bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
2122 int node)
2123 {
2124 return kmalloc_node(size, flags, node);
2125 }
2126
2127 static inline void *
bpf_map_kzalloc(const struct bpf_map * map,size_t size,gfp_t flags)2128 bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
2129 {
2130 return kzalloc(size, flags);
2131 }
2132
2133 static inline void *
bpf_map_kvcalloc(struct bpf_map * map,size_t n,size_t size,gfp_t flags)2134 bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size, gfp_t flags)
2135 {
2136 return kvcalloc(n, size, flags);
2137 }
2138
2139 static inline void __percpu *
bpf_map_alloc_percpu(const struct bpf_map * map,size_t size,size_t align,gfp_t flags)2140 bpf_map_alloc_percpu(const struct bpf_map *map, size_t size, size_t align,
2141 gfp_t flags)
2142 {
2143 return __alloc_percpu_gfp(size, align, flags);
2144 }
2145 #endif
2146
2147 static inline int
bpf_map_init_elem_count(struct bpf_map * map)2148 bpf_map_init_elem_count(struct bpf_map *map)
2149 {
2150 size_t size = sizeof(*map->elem_count), align = size;
2151 gfp_t flags = GFP_USER | __GFP_NOWARN;
2152
2153 map->elem_count = bpf_map_alloc_percpu(map, size, align, flags);
2154 if (!map->elem_count)
2155 return -ENOMEM;
2156
2157 return 0;
2158 }
2159
2160 static inline void
bpf_map_free_elem_count(struct bpf_map * map)2161 bpf_map_free_elem_count(struct bpf_map *map)
2162 {
2163 free_percpu(map->elem_count);
2164 }
2165
bpf_map_inc_elem_count(struct bpf_map * map)2166 static inline void bpf_map_inc_elem_count(struct bpf_map *map)
2167 {
2168 this_cpu_inc(*map->elem_count);
2169 }
2170
bpf_map_dec_elem_count(struct bpf_map * map)2171 static inline void bpf_map_dec_elem_count(struct bpf_map *map)
2172 {
2173 this_cpu_dec(*map->elem_count);
2174 }
2175
2176 extern int sysctl_unprivileged_bpf_disabled;
2177
bpf_allow_ptr_leaks(void)2178 static inline bool bpf_allow_ptr_leaks(void)
2179 {
2180 return perfmon_capable();
2181 }
2182
bpf_allow_uninit_stack(void)2183 static inline bool bpf_allow_uninit_stack(void)
2184 {
2185 return perfmon_capable();
2186 }
2187
bpf_bypass_spec_v1(void)2188 static inline bool bpf_bypass_spec_v1(void)
2189 {
2190 return perfmon_capable();
2191 }
2192
bpf_bypass_spec_v4(void)2193 static inline bool bpf_bypass_spec_v4(void)
2194 {
2195 return perfmon_capable();
2196 }
2197
2198 int bpf_map_new_fd(struct bpf_map *map, int flags);
2199 int bpf_prog_new_fd(struct bpf_prog *prog);
2200
2201 void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2202 const struct bpf_link_ops *ops, struct bpf_prog *prog);
2203 int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
2204 int bpf_link_settle(struct bpf_link_primer *primer);
2205 void bpf_link_cleanup(struct bpf_link_primer *primer);
2206 void bpf_link_inc(struct bpf_link *link);
2207 void bpf_link_put(struct bpf_link *link);
2208 int bpf_link_new_fd(struct bpf_link *link);
2209 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
2210 struct bpf_link *bpf_link_get_curr_or_next(u32 *id);
2211
2212 int bpf_obj_pin_user(u32 ufd, int path_fd, const char __user *pathname);
2213 int bpf_obj_get_user(int path_fd, const char __user *pathname, int flags);
2214
2215 #define BPF_ITER_FUNC_PREFIX "bpf_iter_"
2216 #define DEFINE_BPF_ITER_FUNC(target, args...) \
2217 extern int bpf_iter_ ## target(args); \
2218 int __init bpf_iter_ ## target(args) { return 0; }
2219
2220 /*
2221 * The task type of iterators.
2222 *
2223 * For BPF task iterators, they can be parameterized with various
2224 * parameters to visit only some of tasks.
2225 *
2226 * BPF_TASK_ITER_ALL (default)
2227 * Iterate over resources of every task.
2228 *
2229 * BPF_TASK_ITER_TID
2230 * Iterate over resources of a task/tid.
2231 *
2232 * BPF_TASK_ITER_TGID
2233 * Iterate over resources of every task of a process / task group.
2234 */
2235 enum bpf_iter_task_type {
2236 BPF_TASK_ITER_ALL = 0,
2237 BPF_TASK_ITER_TID,
2238 BPF_TASK_ITER_TGID,
2239 };
2240
2241 struct bpf_iter_aux_info {
2242 /* for map_elem iter */
2243 struct bpf_map *map;
2244
2245 /* for cgroup iter */
2246 struct {
2247 struct cgroup *start; /* starting cgroup */
2248 enum bpf_cgroup_iter_order order;
2249 } cgroup;
2250 struct {
2251 enum bpf_iter_task_type type;
2252 u32 pid;
2253 } task;
2254 };
2255
2256 typedef int (*bpf_iter_attach_target_t)(struct bpf_prog *prog,
2257 union bpf_iter_link_info *linfo,
2258 struct bpf_iter_aux_info *aux);
2259 typedef void (*bpf_iter_detach_target_t)(struct bpf_iter_aux_info *aux);
2260 typedef void (*bpf_iter_show_fdinfo_t) (const struct bpf_iter_aux_info *aux,
2261 struct seq_file *seq);
2262 typedef int (*bpf_iter_fill_link_info_t)(const struct bpf_iter_aux_info *aux,
2263 struct bpf_link_info *info);
2264 typedef const struct bpf_func_proto *
2265 (*bpf_iter_get_func_proto_t)(enum bpf_func_id func_id,
2266 const struct bpf_prog *prog);
2267
2268 enum bpf_iter_feature {
2269 BPF_ITER_RESCHED = BIT(0),
2270 };
2271
2272 #define BPF_ITER_CTX_ARG_MAX 2
2273 struct bpf_iter_reg {
2274 const char *target;
2275 bpf_iter_attach_target_t attach_target;
2276 bpf_iter_detach_target_t detach_target;
2277 bpf_iter_show_fdinfo_t show_fdinfo;
2278 bpf_iter_fill_link_info_t fill_link_info;
2279 bpf_iter_get_func_proto_t get_func_proto;
2280 u32 ctx_arg_info_size;
2281 u32 feature;
2282 struct bpf_ctx_arg_aux ctx_arg_info[BPF_ITER_CTX_ARG_MAX];
2283 const struct bpf_iter_seq_info *seq_info;
2284 };
2285
2286 struct bpf_iter_meta {
2287 __bpf_md_ptr(struct seq_file *, seq);
2288 u64 session_id;
2289 u64 seq_num;
2290 };
2291
2292 struct bpf_iter__bpf_map_elem {
2293 __bpf_md_ptr(struct bpf_iter_meta *, meta);
2294 __bpf_md_ptr(struct bpf_map *, map);
2295 __bpf_md_ptr(void *, key);
2296 __bpf_md_ptr(void *, value);
2297 };
2298
2299 int bpf_iter_reg_target(const struct bpf_iter_reg *reg_info);
2300 void bpf_iter_unreg_target(const struct bpf_iter_reg *reg_info);
2301 bool bpf_iter_prog_supported(struct bpf_prog *prog);
2302 const struct bpf_func_proto *
2303 bpf_iter_get_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
2304 int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr, struct bpf_prog *prog);
2305 int bpf_iter_new_fd(struct bpf_link *link);
2306 bool bpf_link_is_iter(struct bpf_link *link);
2307 struct bpf_prog *bpf_iter_get_info(struct bpf_iter_meta *meta, bool in_stop);
2308 int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
2309 void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
2310 struct seq_file *seq);
2311 int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
2312 struct bpf_link_info *info);
2313
2314 int map_set_for_each_callback_args(struct bpf_verifier_env *env,
2315 struct bpf_func_state *caller,
2316 struct bpf_func_state *callee);
2317
2318 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
2319 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
2320 int bpf_percpu_hash_update(struct bpf_map *map, void *key, void *value,
2321 u64 flags);
2322 int bpf_percpu_array_update(struct bpf_map *map, void *key, void *value,
2323 u64 flags);
2324
2325 int bpf_stackmap_copy(struct bpf_map *map, void *key, void *value);
2326
2327 int bpf_fd_array_map_update_elem(struct bpf_map *map, struct file *map_file,
2328 void *key, void *value, u64 map_flags);
2329 int bpf_fd_array_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2330 int bpf_fd_htab_map_update_elem(struct bpf_map *map, struct file *map_file,
2331 void *key, void *value, u64 map_flags);
2332 int bpf_fd_htab_map_lookup_elem(struct bpf_map *map, void *key, u32 *value);
2333
2334 int bpf_get_file_flag(int flags);
2335 int bpf_check_uarg_tail_zero(bpfptr_t uaddr, size_t expected_size,
2336 size_t actual_size);
2337
2338 /* verify correctness of eBPF program */
2339 int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, bpfptr_t uattr, u32 uattr_size);
2340
2341 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
2342 void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth);
2343 #endif
2344
2345 struct btf *bpf_get_btf_vmlinux(void);
2346
2347 /* Map specifics */
2348 struct xdp_frame;
2349 struct sk_buff;
2350 struct bpf_dtab_netdev;
2351 struct bpf_cpu_map_entry;
2352
2353 void __dev_flush(void);
2354 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2355 struct net_device *dev_rx);
2356 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2357 struct net_device *dev_rx);
2358 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2359 struct bpf_map *map, bool exclude_ingress);
2360 int dev_map_generic_redirect(struct bpf_dtab_netdev *dst, struct sk_buff *skb,
2361 struct bpf_prog *xdp_prog);
2362 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2363 struct bpf_prog *xdp_prog, struct bpf_map *map,
2364 bool exclude_ingress);
2365
2366 void __cpu_map_flush(void);
2367 int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf,
2368 struct net_device *dev_rx);
2369 int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2370 struct sk_buff *skb);
2371
2372 /* Return map's numa specified by userspace */
bpf_map_attr_numa_node(const union bpf_attr * attr)2373 static inline int bpf_map_attr_numa_node(const union bpf_attr *attr)
2374 {
2375 return (attr->map_flags & BPF_F_NUMA_NODE) ?
2376 attr->numa_node : NUMA_NO_NODE;
2377 }
2378
2379 struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type);
2380 int array_map_alloc_check(union bpf_attr *attr);
2381
2382 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
2383 union bpf_attr __user *uattr);
2384 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
2385 union bpf_attr __user *uattr);
2386 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2387 const union bpf_attr *kattr,
2388 union bpf_attr __user *uattr);
2389 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2390 const union bpf_attr *kattr,
2391 union bpf_attr __user *uattr);
2392 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
2393 const union bpf_attr *kattr,
2394 union bpf_attr __user *uattr);
2395 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2396 const union bpf_attr *kattr,
2397 union bpf_attr __user *uattr);
2398 int bpf_prog_test_run_nf(struct bpf_prog *prog,
2399 const union bpf_attr *kattr,
2400 union bpf_attr __user *uattr);
2401 bool btf_ctx_access(int off, int size, enum bpf_access_type type,
2402 const struct bpf_prog *prog,
2403 struct bpf_insn_access_aux *info);
2404
bpf_tracing_ctx_access(int off,int size,enum bpf_access_type type)2405 static inline bool bpf_tracing_ctx_access(int off, int size,
2406 enum bpf_access_type type)
2407 {
2408 if (off < 0 || off >= sizeof(__u64) * MAX_BPF_FUNC_ARGS)
2409 return false;
2410 if (type != BPF_READ)
2411 return false;
2412 if (off % size != 0)
2413 return false;
2414 return true;
2415 }
2416
bpf_tracing_btf_ctx_access(int off,int size,enum bpf_access_type type,const struct bpf_prog * prog,struct bpf_insn_access_aux * info)2417 static inline bool bpf_tracing_btf_ctx_access(int off, int size,
2418 enum bpf_access_type type,
2419 const struct bpf_prog *prog,
2420 struct bpf_insn_access_aux *info)
2421 {
2422 if (!bpf_tracing_ctx_access(off, size, type))
2423 return false;
2424 return btf_ctx_access(off, size, type, prog, info);
2425 }
2426
2427 int btf_struct_access(struct bpf_verifier_log *log,
2428 const struct bpf_reg_state *reg,
2429 int off, int size, enum bpf_access_type atype,
2430 u32 *next_btf_id, enum bpf_type_flag *flag, const char **field_name);
2431 bool btf_struct_ids_match(struct bpf_verifier_log *log,
2432 const struct btf *btf, u32 id, int off,
2433 const struct btf *need_btf, u32 need_type_id,
2434 bool strict);
2435
2436 int btf_distill_func_proto(struct bpf_verifier_log *log,
2437 struct btf *btf,
2438 const struct btf_type *func_proto,
2439 const char *func_name,
2440 struct btf_func_model *m);
2441
2442 struct bpf_reg_state;
2443 int btf_check_subprog_arg_match(struct bpf_verifier_env *env, int subprog,
2444 struct bpf_reg_state *regs);
2445 int btf_check_subprog_call(struct bpf_verifier_env *env, int subprog,
2446 struct bpf_reg_state *regs);
2447 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
2448 struct bpf_reg_state *reg);
2449 int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
2450 struct btf *btf, const struct btf_type *t);
2451
2452 struct bpf_prog *bpf_prog_by_id(u32 id);
2453 struct bpf_link *bpf_link_by_id(u32 id);
2454
2455 const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
2456 void bpf_task_storage_free(struct task_struct *task);
2457 void bpf_cgrp_storage_free(struct cgroup *cgroup);
2458 bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
2459 const struct btf_func_model *
2460 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2461 const struct bpf_insn *insn);
2462 int bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2463 u16 btf_fd_idx, u8 **func_addr);
2464
2465 struct bpf_core_ctx {
2466 struct bpf_verifier_log *log;
2467 const struct btf *btf;
2468 };
2469
2470 bool btf_nested_type_is_trusted(struct bpf_verifier_log *log,
2471 const struct bpf_reg_state *reg,
2472 const char *field_name, u32 btf_id, const char *suffix);
2473
2474 bool btf_type_ids_nocast_alias(struct bpf_verifier_log *log,
2475 const struct btf *reg_btf, u32 reg_id,
2476 const struct btf *arg_btf, u32 arg_id);
2477
2478 int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
2479 int relo_idx, void *insn);
2480
unprivileged_ebpf_enabled(void)2481 static inline bool unprivileged_ebpf_enabled(void)
2482 {
2483 return !sysctl_unprivileged_bpf_disabled;
2484 }
2485
2486 /* Not all bpf prog type has the bpf_ctx.
2487 * For the bpf prog type that has initialized the bpf_ctx,
2488 * this function can be used to decide if a kernel function
2489 * is called by a bpf program.
2490 */
has_current_bpf_ctx(void)2491 static inline bool has_current_bpf_ctx(void)
2492 {
2493 return !!current->bpf_ctx;
2494 }
2495
2496 void notrace bpf_prog_inc_misses_counter(struct bpf_prog *prog);
2497
2498 void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2499 enum bpf_dynptr_type type, u32 offset, u32 size);
2500 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
2501 void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr);
2502 #else /* !CONFIG_BPF_SYSCALL */
bpf_prog_get(u32 ufd)2503 static inline struct bpf_prog *bpf_prog_get(u32 ufd)
2504 {
2505 return ERR_PTR(-EOPNOTSUPP);
2506 }
2507
bpf_prog_get_type_dev(u32 ufd,enum bpf_prog_type type,bool attach_drv)2508 static inline struct bpf_prog *bpf_prog_get_type_dev(u32 ufd,
2509 enum bpf_prog_type type,
2510 bool attach_drv)
2511 {
2512 return ERR_PTR(-EOPNOTSUPP);
2513 }
2514
bpf_prog_add(struct bpf_prog * prog,int i)2515 static inline void bpf_prog_add(struct bpf_prog *prog, int i)
2516 {
2517 }
2518
bpf_prog_sub(struct bpf_prog * prog,int i)2519 static inline void bpf_prog_sub(struct bpf_prog *prog, int i)
2520 {
2521 }
2522
bpf_prog_put(struct bpf_prog * prog)2523 static inline void bpf_prog_put(struct bpf_prog *prog)
2524 {
2525 }
2526
bpf_prog_inc(struct bpf_prog * prog)2527 static inline void bpf_prog_inc(struct bpf_prog *prog)
2528 {
2529 }
2530
2531 static inline struct bpf_prog *__must_check
bpf_prog_inc_not_zero(struct bpf_prog * prog)2532 bpf_prog_inc_not_zero(struct bpf_prog *prog)
2533 {
2534 return ERR_PTR(-EOPNOTSUPP);
2535 }
2536
bpf_link_init(struct bpf_link * link,enum bpf_link_type type,const struct bpf_link_ops * ops,struct bpf_prog * prog)2537 static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
2538 const struct bpf_link_ops *ops,
2539 struct bpf_prog *prog)
2540 {
2541 }
2542
bpf_link_prime(struct bpf_link * link,struct bpf_link_primer * primer)2543 static inline int bpf_link_prime(struct bpf_link *link,
2544 struct bpf_link_primer *primer)
2545 {
2546 return -EOPNOTSUPP;
2547 }
2548
bpf_link_settle(struct bpf_link_primer * primer)2549 static inline int bpf_link_settle(struct bpf_link_primer *primer)
2550 {
2551 return -EOPNOTSUPP;
2552 }
2553
bpf_link_cleanup(struct bpf_link_primer * primer)2554 static inline void bpf_link_cleanup(struct bpf_link_primer *primer)
2555 {
2556 }
2557
bpf_link_inc(struct bpf_link * link)2558 static inline void bpf_link_inc(struct bpf_link *link)
2559 {
2560 }
2561
bpf_link_put(struct bpf_link * link)2562 static inline void bpf_link_put(struct bpf_link *link)
2563 {
2564 }
2565
bpf_obj_get_user(const char __user * pathname,int flags)2566 static inline int bpf_obj_get_user(const char __user *pathname, int flags)
2567 {
2568 return -EOPNOTSUPP;
2569 }
2570
__dev_flush(void)2571 static inline void __dev_flush(void)
2572 {
2573 }
2574
2575 struct xdp_frame;
2576 struct bpf_dtab_netdev;
2577 struct bpf_cpu_map_entry;
2578
2579 static inline
dev_xdp_enqueue(struct net_device * dev,struct xdp_frame * xdpf,struct net_device * dev_rx)2580 int dev_xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
2581 struct net_device *dev_rx)
2582 {
2583 return 0;
2584 }
2585
2586 static inline
dev_map_enqueue(struct bpf_dtab_netdev * dst,struct xdp_frame * xdpf,struct net_device * dev_rx)2587 int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf,
2588 struct net_device *dev_rx)
2589 {
2590 return 0;
2591 }
2592
2593 static inline
dev_map_enqueue_multi(struct xdp_frame * xdpf,struct net_device * dev_rx,struct bpf_map * map,bool exclude_ingress)2594 int dev_map_enqueue_multi(struct xdp_frame *xdpf, struct net_device *dev_rx,
2595 struct bpf_map *map, bool exclude_ingress)
2596 {
2597 return 0;
2598 }
2599
2600 struct sk_buff;
2601
dev_map_generic_redirect(struct bpf_dtab_netdev * dst,struct sk_buff * skb,struct bpf_prog * xdp_prog)2602 static inline int dev_map_generic_redirect(struct bpf_dtab_netdev *dst,
2603 struct sk_buff *skb,
2604 struct bpf_prog *xdp_prog)
2605 {
2606 return 0;
2607 }
2608
2609 static inline
dev_map_redirect_multi(struct net_device * dev,struct sk_buff * skb,struct bpf_prog * xdp_prog,struct bpf_map * map,bool exclude_ingress)2610 int dev_map_redirect_multi(struct net_device *dev, struct sk_buff *skb,
2611 struct bpf_prog *xdp_prog, struct bpf_map *map,
2612 bool exclude_ingress)
2613 {
2614 return 0;
2615 }
2616
__cpu_map_flush(void)2617 static inline void __cpu_map_flush(void)
2618 {
2619 }
2620
cpu_map_enqueue(struct bpf_cpu_map_entry * rcpu,struct xdp_frame * xdpf,struct net_device * dev_rx)2621 static inline int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu,
2622 struct xdp_frame *xdpf,
2623 struct net_device *dev_rx)
2624 {
2625 return 0;
2626 }
2627
cpu_map_generic_redirect(struct bpf_cpu_map_entry * rcpu,struct sk_buff * skb)2628 static inline int cpu_map_generic_redirect(struct bpf_cpu_map_entry *rcpu,
2629 struct sk_buff *skb)
2630 {
2631 return -EOPNOTSUPP;
2632 }
2633
bpf_prog_get_type_path(const char * name,enum bpf_prog_type type)2634 static inline struct bpf_prog *bpf_prog_get_type_path(const char *name,
2635 enum bpf_prog_type type)
2636 {
2637 return ERR_PTR(-EOPNOTSUPP);
2638 }
2639
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2640 static inline int bpf_prog_test_run_xdp(struct bpf_prog *prog,
2641 const union bpf_attr *kattr,
2642 union bpf_attr __user *uattr)
2643 {
2644 return -ENOTSUPP;
2645 }
2646
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2647 static inline int bpf_prog_test_run_skb(struct bpf_prog *prog,
2648 const union bpf_attr *kattr,
2649 union bpf_attr __user *uattr)
2650 {
2651 return -ENOTSUPP;
2652 }
2653
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2654 static inline int bpf_prog_test_run_tracing(struct bpf_prog *prog,
2655 const union bpf_attr *kattr,
2656 union bpf_attr __user *uattr)
2657 {
2658 return -ENOTSUPP;
2659 }
2660
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2661 static inline int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
2662 const union bpf_attr *kattr,
2663 union bpf_attr __user *uattr)
2664 {
2665 return -ENOTSUPP;
2666 }
2667
bpf_prog_test_run_sk_lookup(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2668 static inline int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog,
2669 const union bpf_attr *kattr,
2670 union bpf_attr __user *uattr)
2671 {
2672 return -ENOTSUPP;
2673 }
2674
bpf_map_put(struct bpf_map * map)2675 static inline void bpf_map_put(struct bpf_map *map)
2676 {
2677 }
2678
bpf_prog_by_id(u32 id)2679 static inline struct bpf_prog *bpf_prog_by_id(u32 id)
2680 {
2681 return ERR_PTR(-ENOTSUPP);
2682 }
2683
btf_struct_access(struct bpf_verifier_log * log,const struct bpf_reg_state * reg,int off,int size,enum bpf_access_type atype,u32 * next_btf_id,enum bpf_type_flag * flag,const char ** field_name)2684 static inline int btf_struct_access(struct bpf_verifier_log *log,
2685 const struct bpf_reg_state *reg,
2686 int off, int size, enum bpf_access_type atype,
2687 u32 *next_btf_id, enum bpf_type_flag *flag,
2688 const char **field_name)
2689 {
2690 return -EACCES;
2691 }
2692
2693 static inline const struct bpf_func_proto *
bpf_base_func_proto(enum bpf_func_id func_id)2694 bpf_base_func_proto(enum bpf_func_id func_id)
2695 {
2696 return NULL;
2697 }
2698
bpf_task_storage_free(struct task_struct * task)2699 static inline void bpf_task_storage_free(struct task_struct *task)
2700 {
2701 }
2702
bpf_prog_has_kfunc_call(const struct bpf_prog * prog)2703 static inline bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog)
2704 {
2705 return false;
2706 }
2707
2708 static inline const struct btf_func_model *
bpf_jit_find_kfunc_model(const struct bpf_prog * prog,const struct bpf_insn * insn)2709 bpf_jit_find_kfunc_model(const struct bpf_prog *prog,
2710 const struct bpf_insn *insn)
2711 {
2712 return NULL;
2713 }
2714
2715 static inline int
bpf_get_kfunc_addr(const struct bpf_prog * prog,u32 func_id,u16 btf_fd_idx,u8 ** func_addr)2716 bpf_get_kfunc_addr(const struct bpf_prog *prog, u32 func_id,
2717 u16 btf_fd_idx, u8 **func_addr)
2718 {
2719 return -ENOTSUPP;
2720 }
2721
unprivileged_ebpf_enabled(void)2722 static inline bool unprivileged_ebpf_enabled(void)
2723 {
2724 return false;
2725 }
2726
has_current_bpf_ctx(void)2727 static inline bool has_current_bpf_ctx(void)
2728 {
2729 return false;
2730 }
2731
bpf_prog_inc_misses_counter(struct bpf_prog * prog)2732 static inline void bpf_prog_inc_misses_counter(struct bpf_prog *prog)
2733 {
2734 }
2735
bpf_cgrp_storage_free(struct cgroup * cgroup)2736 static inline void bpf_cgrp_storage_free(struct cgroup *cgroup)
2737 {
2738 }
2739
bpf_dynptr_init(struct bpf_dynptr_kern * ptr,void * data,enum bpf_dynptr_type type,u32 offset,u32 size)2740 static inline void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
2741 enum bpf_dynptr_type type, u32 offset, u32 size)
2742 {
2743 }
2744
bpf_dynptr_set_null(struct bpf_dynptr_kern * ptr)2745 static inline void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr)
2746 {
2747 }
2748
bpf_dynptr_set_rdonly(struct bpf_dynptr_kern * ptr)2749 static inline void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr)
2750 {
2751 }
2752 #endif /* CONFIG_BPF_SYSCALL */
2753
2754 static __always_inline int
bpf_probe_read_kernel_common(void * dst,u32 size,const void * unsafe_ptr)2755 bpf_probe_read_kernel_common(void *dst, u32 size, const void *unsafe_ptr)
2756 {
2757 int ret = -EFAULT;
2758
2759 if (IS_ENABLED(CONFIG_BPF_EVENTS))
2760 ret = copy_from_kernel_nofault(dst, unsafe_ptr, size);
2761 if (unlikely(ret < 0))
2762 memset(dst, 0, size);
2763 return ret;
2764 }
2765
2766 void __bpf_free_used_btfs(struct bpf_prog_aux *aux,
2767 struct btf_mod_pair *used_btfs, u32 len);
2768
bpf_prog_get_type(u32 ufd,enum bpf_prog_type type)2769 static inline struct bpf_prog *bpf_prog_get_type(u32 ufd,
2770 enum bpf_prog_type type)
2771 {
2772 return bpf_prog_get_type_dev(ufd, type, false);
2773 }
2774
2775 void __bpf_free_used_maps(struct bpf_prog_aux *aux,
2776 struct bpf_map **used_maps, u32 len);
2777
2778 bool bpf_prog_get_ok(struct bpf_prog *, enum bpf_prog_type *, bool);
2779
2780 int bpf_prog_offload_compile(struct bpf_prog *prog);
2781 void bpf_prog_dev_bound_destroy(struct bpf_prog *prog);
2782 int bpf_prog_offload_info_fill(struct bpf_prog_info *info,
2783 struct bpf_prog *prog);
2784
2785 int bpf_map_offload_info_fill(struct bpf_map_info *info, struct bpf_map *map);
2786
2787 int bpf_map_offload_lookup_elem(struct bpf_map *map, void *key, void *value);
2788 int bpf_map_offload_update_elem(struct bpf_map *map,
2789 void *key, void *value, u64 flags);
2790 int bpf_map_offload_delete_elem(struct bpf_map *map, void *key);
2791 int bpf_map_offload_get_next_key(struct bpf_map *map,
2792 void *key, void *next_key);
2793
2794 bool bpf_offload_prog_map_match(struct bpf_prog *prog, struct bpf_map *map);
2795
2796 struct bpf_offload_dev *
2797 bpf_offload_dev_create(const struct bpf_prog_offload_ops *ops, void *priv);
2798 void bpf_offload_dev_destroy(struct bpf_offload_dev *offdev);
2799 void *bpf_offload_dev_priv(struct bpf_offload_dev *offdev);
2800 int bpf_offload_dev_netdev_register(struct bpf_offload_dev *offdev,
2801 struct net_device *netdev);
2802 void bpf_offload_dev_netdev_unregister(struct bpf_offload_dev *offdev,
2803 struct net_device *netdev);
2804 bool bpf_offload_dev_match(struct bpf_prog *prog, struct net_device *netdev);
2805
2806 void unpriv_ebpf_notify(int new_state);
2807
2808 #if defined(CONFIG_NET) && defined(CONFIG_BPF_SYSCALL)
2809 int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2810 struct bpf_prog_aux *prog_aux);
2811 void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id);
2812 int bpf_prog_dev_bound_init(struct bpf_prog *prog, union bpf_attr *attr);
2813 int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog, struct bpf_prog *old_prog);
2814 void bpf_dev_bound_netdev_unregister(struct net_device *dev);
2815
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2816 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2817 {
2818 return aux->dev_bound;
2819 }
2820
bpf_prog_is_offloaded(const struct bpf_prog_aux * aux)2821 static inline bool bpf_prog_is_offloaded(const struct bpf_prog_aux *aux)
2822 {
2823 return aux->offload_requested;
2824 }
2825
2826 bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs);
2827
bpf_map_is_offloaded(struct bpf_map * map)2828 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2829 {
2830 return unlikely(map->ops == &bpf_map_offload_ops);
2831 }
2832
2833 struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr);
2834 void bpf_map_offload_map_free(struct bpf_map *map);
2835 u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map);
2836 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2837 const union bpf_attr *kattr,
2838 union bpf_attr __user *uattr);
2839
2840 int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog);
2841 int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype);
2842 int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags);
2843 int sock_map_bpf_prog_query(const union bpf_attr *attr,
2844 union bpf_attr __user *uattr);
2845
2846 void sock_map_unhash(struct sock *sk);
2847 void sock_map_destroy(struct sock *sk);
2848 void sock_map_close(struct sock *sk, long timeout);
2849 #else
bpf_dev_bound_kfunc_check(struct bpf_verifier_log * log,struct bpf_prog_aux * prog_aux)2850 static inline int bpf_dev_bound_kfunc_check(struct bpf_verifier_log *log,
2851 struct bpf_prog_aux *prog_aux)
2852 {
2853 return -EOPNOTSUPP;
2854 }
2855
bpf_dev_bound_resolve_kfunc(struct bpf_prog * prog,u32 func_id)2856 static inline void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog,
2857 u32 func_id)
2858 {
2859 return NULL;
2860 }
2861
bpf_prog_dev_bound_init(struct bpf_prog * prog,union bpf_attr * attr)2862 static inline int bpf_prog_dev_bound_init(struct bpf_prog *prog,
2863 union bpf_attr *attr)
2864 {
2865 return -EOPNOTSUPP;
2866 }
2867
bpf_prog_dev_bound_inherit(struct bpf_prog * new_prog,struct bpf_prog * old_prog)2868 static inline int bpf_prog_dev_bound_inherit(struct bpf_prog *new_prog,
2869 struct bpf_prog *old_prog)
2870 {
2871 return -EOPNOTSUPP;
2872 }
2873
bpf_dev_bound_netdev_unregister(struct net_device * dev)2874 static inline void bpf_dev_bound_netdev_unregister(struct net_device *dev)
2875 {
2876 }
2877
bpf_prog_is_dev_bound(const struct bpf_prog_aux * aux)2878 static inline bool bpf_prog_is_dev_bound(const struct bpf_prog_aux *aux)
2879 {
2880 return false;
2881 }
2882
bpf_prog_is_offloaded(struct bpf_prog_aux * aux)2883 static inline bool bpf_prog_is_offloaded(struct bpf_prog_aux *aux)
2884 {
2885 return false;
2886 }
2887
bpf_prog_dev_bound_match(const struct bpf_prog * lhs,const struct bpf_prog * rhs)2888 static inline bool bpf_prog_dev_bound_match(const struct bpf_prog *lhs, const struct bpf_prog *rhs)
2889 {
2890 return false;
2891 }
2892
bpf_map_is_offloaded(struct bpf_map * map)2893 static inline bool bpf_map_is_offloaded(struct bpf_map *map)
2894 {
2895 return false;
2896 }
2897
bpf_map_offload_map_alloc(union bpf_attr * attr)2898 static inline struct bpf_map *bpf_map_offload_map_alloc(union bpf_attr *attr)
2899 {
2900 return ERR_PTR(-EOPNOTSUPP);
2901 }
2902
bpf_map_offload_map_free(struct bpf_map * map)2903 static inline void bpf_map_offload_map_free(struct bpf_map *map)
2904 {
2905 }
2906
bpf_map_offload_map_mem_usage(const struct bpf_map * map)2907 static inline u64 bpf_map_offload_map_mem_usage(const struct bpf_map *map)
2908 {
2909 return 0;
2910 }
2911
bpf_prog_test_run_syscall(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)2912 static inline int bpf_prog_test_run_syscall(struct bpf_prog *prog,
2913 const union bpf_attr *kattr,
2914 union bpf_attr __user *uattr)
2915 {
2916 return -ENOTSUPP;
2917 }
2918
2919 #ifdef CONFIG_BPF_SYSCALL
sock_map_get_from_fd(const union bpf_attr * attr,struct bpf_prog * prog)2920 static inline int sock_map_get_from_fd(const union bpf_attr *attr,
2921 struct bpf_prog *prog)
2922 {
2923 return -EINVAL;
2924 }
2925
sock_map_prog_detach(const union bpf_attr * attr,enum bpf_prog_type ptype)2926 static inline int sock_map_prog_detach(const union bpf_attr *attr,
2927 enum bpf_prog_type ptype)
2928 {
2929 return -EOPNOTSUPP;
2930 }
2931
sock_map_update_elem_sys(struct bpf_map * map,void * key,void * value,u64 flags)2932 static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value,
2933 u64 flags)
2934 {
2935 return -EOPNOTSUPP;
2936 }
2937
sock_map_bpf_prog_query(const union bpf_attr * attr,union bpf_attr __user * uattr)2938 static inline int sock_map_bpf_prog_query(const union bpf_attr *attr,
2939 union bpf_attr __user *uattr)
2940 {
2941 return -EINVAL;
2942 }
2943 #endif /* CONFIG_BPF_SYSCALL */
2944 #endif /* CONFIG_NET && CONFIG_BPF_SYSCALL */
2945
2946 #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL)
2947 void bpf_sk_reuseport_detach(struct sock *sk);
2948 int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
2949 void *value);
2950 int bpf_fd_reuseport_array_update_elem(struct bpf_map *map, void *key,
2951 void *value, u64 map_flags);
2952 #else
bpf_sk_reuseport_detach(struct sock * sk)2953 static inline void bpf_sk_reuseport_detach(struct sock *sk)
2954 {
2955 }
2956
2957 #ifdef CONFIG_BPF_SYSCALL
bpf_fd_reuseport_array_lookup_elem(struct bpf_map * map,void * key,void * value)2958 static inline int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map,
2959 void *key, void *value)
2960 {
2961 return -EOPNOTSUPP;
2962 }
2963
bpf_fd_reuseport_array_update_elem(struct bpf_map * map,void * key,void * value,u64 map_flags)2964 static inline int bpf_fd_reuseport_array_update_elem(struct bpf_map *map,
2965 void *key, void *value,
2966 u64 map_flags)
2967 {
2968 return -EOPNOTSUPP;
2969 }
2970 #endif /* CONFIG_BPF_SYSCALL */
2971 #endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
2972
2973 /* verifier prototypes for helper functions called from eBPF programs */
2974 extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
2975 extern const struct bpf_func_proto bpf_map_update_elem_proto;
2976 extern const struct bpf_func_proto bpf_map_delete_elem_proto;
2977 extern const struct bpf_func_proto bpf_map_push_elem_proto;
2978 extern const struct bpf_func_proto bpf_map_pop_elem_proto;
2979 extern const struct bpf_func_proto bpf_map_peek_elem_proto;
2980 extern const struct bpf_func_proto bpf_map_lookup_percpu_elem_proto;
2981
2982 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
2983 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
2984 extern const struct bpf_func_proto bpf_get_numa_node_id_proto;
2985 extern const struct bpf_func_proto bpf_tail_call_proto;
2986 extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
2987 extern const struct bpf_func_proto bpf_ktime_get_boot_ns_proto;
2988 extern const struct bpf_func_proto bpf_ktime_get_tai_ns_proto;
2989 extern const struct bpf_func_proto bpf_get_current_pid_tgid_proto;
2990 extern const struct bpf_func_proto bpf_get_current_uid_gid_proto;
2991 extern const struct bpf_func_proto bpf_get_current_comm_proto;
2992 extern const struct bpf_func_proto bpf_get_stackid_proto;
2993 extern const struct bpf_func_proto bpf_get_stack_proto;
2994 extern const struct bpf_func_proto bpf_get_task_stack_proto;
2995 extern const struct bpf_func_proto bpf_get_stackid_proto_pe;
2996 extern const struct bpf_func_proto bpf_get_stack_proto_pe;
2997 extern const struct bpf_func_proto bpf_sock_map_update_proto;
2998 extern const struct bpf_func_proto bpf_sock_hash_update_proto;
2999 extern const struct bpf_func_proto bpf_get_current_cgroup_id_proto;
3000 extern const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto;
3001 extern const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto;
3002 extern const struct bpf_func_proto bpf_msg_redirect_hash_proto;
3003 extern const struct bpf_func_proto bpf_msg_redirect_map_proto;
3004 extern const struct bpf_func_proto bpf_sk_redirect_hash_proto;
3005 extern const struct bpf_func_proto bpf_sk_redirect_map_proto;
3006 extern const struct bpf_func_proto bpf_spin_lock_proto;
3007 extern const struct bpf_func_proto bpf_spin_unlock_proto;
3008 extern const struct bpf_func_proto bpf_get_local_storage_proto;
3009 extern const struct bpf_func_proto bpf_strtol_proto;
3010 extern const struct bpf_func_proto bpf_strtoul_proto;
3011 extern const struct bpf_func_proto bpf_tcp_sock_proto;
3012 extern const struct bpf_func_proto bpf_jiffies64_proto;
3013 extern const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto;
3014 extern const struct bpf_func_proto bpf_event_output_data_proto;
3015 extern const struct bpf_func_proto bpf_ringbuf_output_proto;
3016 extern const struct bpf_func_proto bpf_ringbuf_reserve_proto;
3017 extern const struct bpf_func_proto bpf_ringbuf_submit_proto;
3018 extern const struct bpf_func_proto bpf_ringbuf_discard_proto;
3019 extern const struct bpf_func_proto bpf_ringbuf_query_proto;
3020 extern const struct bpf_func_proto bpf_ringbuf_reserve_dynptr_proto;
3021 extern const struct bpf_func_proto bpf_ringbuf_submit_dynptr_proto;
3022 extern const struct bpf_func_proto bpf_ringbuf_discard_dynptr_proto;
3023 extern const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto;
3024 extern const struct bpf_func_proto bpf_skc_to_tcp_sock_proto;
3025 extern const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto;
3026 extern const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto;
3027 extern const struct bpf_func_proto bpf_skc_to_udp6_sock_proto;
3028 extern const struct bpf_func_proto bpf_skc_to_unix_sock_proto;
3029 extern const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto;
3030 extern const struct bpf_func_proto bpf_copy_from_user_proto;
3031 extern const struct bpf_func_proto bpf_snprintf_btf_proto;
3032 extern const struct bpf_func_proto bpf_snprintf_proto;
3033 extern const struct bpf_func_proto bpf_per_cpu_ptr_proto;
3034 extern const struct bpf_func_proto bpf_this_cpu_ptr_proto;
3035 extern const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto;
3036 extern const struct bpf_func_proto bpf_sock_from_file_proto;
3037 extern const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto;
3038 extern const struct bpf_func_proto bpf_task_storage_get_recur_proto;
3039 extern const struct bpf_func_proto bpf_task_storage_get_proto;
3040 extern const struct bpf_func_proto bpf_task_storage_delete_recur_proto;
3041 extern const struct bpf_func_proto bpf_task_storage_delete_proto;
3042 extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
3043 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
3044 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
3045 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
3046 extern const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto;
3047 extern const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto;
3048 extern const struct bpf_func_proto bpf_find_vma_proto;
3049 extern const struct bpf_func_proto bpf_loop_proto;
3050 extern const struct bpf_func_proto bpf_copy_from_user_task_proto;
3051 extern const struct bpf_func_proto bpf_set_retval_proto;
3052 extern const struct bpf_func_proto bpf_get_retval_proto;
3053 extern const struct bpf_func_proto bpf_user_ringbuf_drain_proto;
3054 extern const struct bpf_func_proto bpf_cgrp_storage_get_proto;
3055 extern const struct bpf_func_proto bpf_cgrp_storage_delete_proto;
3056
3057 const struct bpf_func_proto *tracing_prog_func_proto(
3058 enum bpf_func_id func_id, const struct bpf_prog *prog);
3059
3060 /* Shared helpers among cBPF and eBPF. */
3061 void bpf_user_rnd_init_once(void);
3062 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3063 u64 bpf_get_raw_cpu_id(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
3064
3065 #if defined(CONFIG_NET)
3066 bool bpf_sock_common_is_valid_access(int off, int size,
3067 enum bpf_access_type type,
3068 struct bpf_insn_access_aux *info);
3069 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3070 struct bpf_insn_access_aux *info);
3071 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3072 const struct bpf_insn *si,
3073 struct bpf_insn *insn_buf,
3074 struct bpf_prog *prog,
3075 u32 *target_size);
3076 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3077 struct bpf_dynptr_kern *ptr);
3078 #else
bpf_sock_common_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3079 static inline bool bpf_sock_common_is_valid_access(int off, int size,
3080 enum bpf_access_type type,
3081 struct bpf_insn_access_aux *info)
3082 {
3083 return false;
3084 }
bpf_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3085 static inline bool bpf_sock_is_valid_access(int off, int size,
3086 enum bpf_access_type type,
3087 struct bpf_insn_access_aux *info)
3088 {
3089 return false;
3090 }
bpf_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3091 static inline u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
3092 const struct bpf_insn *si,
3093 struct bpf_insn *insn_buf,
3094 struct bpf_prog *prog,
3095 u32 *target_size)
3096 {
3097 return 0;
3098 }
bpf_dynptr_from_skb_rdonly(struct sk_buff * skb,u64 flags,struct bpf_dynptr_kern * ptr)3099 static inline int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags,
3100 struct bpf_dynptr_kern *ptr)
3101 {
3102 return -EOPNOTSUPP;
3103 }
3104 #endif
3105
3106 #ifdef CONFIG_INET
3107 struct sk_reuseport_kern {
3108 struct sk_buff *skb;
3109 struct sock *sk;
3110 struct sock *selected_sk;
3111 struct sock *migrating_sk;
3112 void *data_end;
3113 u32 hash;
3114 u32 reuseport_id;
3115 bool bind_inany;
3116 };
3117 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3118 struct bpf_insn_access_aux *info);
3119
3120 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3121 const struct bpf_insn *si,
3122 struct bpf_insn *insn_buf,
3123 struct bpf_prog *prog,
3124 u32 *target_size);
3125
3126 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
3127 struct bpf_insn_access_aux *info);
3128
3129 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3130 const struct bpf_insn *si,
3131 struct bpf_insn *insn_buf,
3132 struct bpf_prog *prog,
3133 u32 *target_size);
3134 #else
bpf_tcp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3135 static inline bool bpf_tcp_sock_is_valid_access(int off, int size,
3136 enum bpf_access_type type,
3137 struct bpf_insn_access_aux *info)
3138 {
3139 return false;
3140 }
3141
bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3142 static inline u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
3143 const struct bpf_insn *si,
3144 struct bpf_insn *insn_buf,
3145 struct bpf_prog *prog,
3146 u32 *target_size)
3147 {
3148 return 0;
3149 }
bpf_xdp_sock_is_valid_access(int off,int size,enum bpf_access_type type,struct bpf_insn_access_aux * info)3150 static inline bool bpf_xdp_sock_is_valid_access(int off, int size,
3151 enum bpf_access_type type,
3152 struct bpf_insn_access_aux *info)
3153 {
3154 return false;
3155 }
3156
bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,const struct bpf_insn * si,struct bpf_insn * insn_buf,struct bpf_prog * prog,u32 * target_size)3157 static inline u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
3158 const struct bpf_insn *si,
3159 struct bpf_insn *insn_buf,
3160 struct bpf_prog *prog,
3161 u32 *target_size)
3162 {
3163 return 0;
3164 }
3165 #endif /* CONFIG_INET */
3166
3167 enum bpf_text_poke_type {
3168 BPF_MOD_CALL,
3169 BPF_MOD_JUMP,
3170 };
3171
3172 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
3173 void *addr1, void *addr2);
3174
3175 void bpf_arch_poke_desc_update(struct bpf_jit_poke_descriptor *poke,
3176 struct bpf_prog *new, struct bpf_prog *old);
3177
3178 void *bpf_arch_text_copy(void *dst, void *src, size_t len);
3179 int bpf_arch_text_invalidate(void *dst, size_t len);
3180
3181 struct btf_id_set;
3182 bool btf_id_set_contains(const struct btf_id_set *set, u32 id);
3183
3184 #define MAX_BPRINTF_VARARGS 12
3185 #define MAX_BPRINTF_BUF 1024
3186
3187 struct bpf_bprintf_data {
3188 u32 *bin_args;
3189 char *buf;
3190 bool get_bin_args;
3191 bool get_buf;
3192 };
3193
3194 int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
3195 u32 num_args, struct bpf_bprintf_data *data);
3196 void bpf_bprintf_cleanup(struct bpf_bprintf_data *data);
3197
3198 #ifdef CONFIG_BPF_LSM
3199 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
3200 void bpf_cgroup_atype_put(int cgroup_atype);
3201 #else
bpf_cgroup_atype_get(u32 attach_btf_id,int cgroup_atype)3202 static inline void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype) {}
bpf_cgroup_atype_put(int cgroup_atype)3203 static inline void bpf_cgroup_atype_put(int cgroup_atype) {}
3204 #endif /* CONFIG_BPF_LSM */
3205
3206 struct key;
3207
3208 #ifdef CONFIG_KEYS
3209 struct bpf_key {
3210 struct key *key;
3211 bool has_ref;
3212 };
3213 #endif /* CONFIG_KEYS */
3214
type_is_alloc(u32 type)3215 static inline bool type_is_alloc(u32 type)
3216 {
3217 return type & MEM_ALLOC;
3218 }
3219
bpf_memcg_flags(gfp_t flags)3220 static inline gfp_t bpf_memcg_flags(gfp_t flags)
3221 {
3222 if (memcg_bpf_enabled())
3223 return flags | __GFP_ACCOUNT;
3224 return flags;
3225 }
3226
3227 #endif /* _LINUX_BPF_H */
3228